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|                                                    |   | Filed Pursuant to Rule 424(b)(3) |
|                                                    |   | Registration No. 333-217029 |
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| Subject to Completion, Dated December 3, 2018           |
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| PRELIMINARY PRICING SUPPLEMENT                          |   |   |
| Dated December 3, 2018 to                               |   |   |
| PROSPECTUS SUPPLEMENT                                   |   |   |
| Dated March 30, 2017 and                                |   |   |
| PROSPECTUS                                              |   |   |
| Dated March 30, 2017                                    |   |   |
| CATERPILLAR FINANCIAL SERVICES CORPORATION              |
| MEDIUM-TERM NOTES, SERIES I, FLOATING RATE NOTES DUE 20 |

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| SUBJECT                                                                                                                                                                                                                                                                                                                                                                                   |   | FINAL PRICING DETAILS |
| Issuer:                                                                                                                                                                                                                                                                                                                                                                                   |   | Caterpillar Financial Services Corporation |
| Title of Securities:                                                                                                                                                                                                                                                                                                                                                                      |   | Medium-Term Notes, Series I, Floating Rate Notes Due 20 |
| Form of Security:                                                                                                                                                                                                                                                                                                                                                                         |   | Global Note |
| Format:                                                                                                                                                                                                                                                                                                                                                                                   |   | SEC Registered-Registration Statement Number 333-217029 |
| Trade Date/Pricing Effective Time:                                                                                                                                                                                                                                                                                                                                                        |   | December   , 2018 |
| Settlement Date (Original Issue Date):                                                                                                                                                                                                                                                                                                                                                    |   | December   , 2018, which is the third business day following the Trade Date. Accordingly, purchasers who wish to trade the Medium Term Notes on any date prior to two business days before delivery will be required, because the Medium-Term Notes will not initially settle in T+2, to specify an alternative settlement date at the time of such trade to prevent a failed settlement and should consult their own advisors. |
| Maturity Date:                                                                                                                                                                                                                                                                                                                                                                            |   | December   , 20 |
| Principal Amount:                                                                                                                                                                                                                                                                                                                                                                         |   | $ |
| Price to Public (Issue Price):                                                                                                                                                                                                                                                                                                                                                            |   | 100.000% |
| Dealer’s Commission:                                                                                                                                                                                                                                                                                                                                                                |   | % (    basis points) |
| All-in-price:                                                                                                                                                                                                                                                                                                                                                                             |   | % |
| Net Proceeds to Issuer:                                                                                                                                                                                                                                                                                                                                                                   |   | $ |
| Interest Rate Basis (Benchmark):                                                                                                                                                                                                                                                                                                                                                          |   | 3 Month USD LIBOR |
| Index Currency:                                                                                                                                                                                                                                                                                                                                                                           |   | U.S. Dollars |
| Spread (Plus or Minus):                                                                                                                                                                                                                                                                                                                                                                   |   | +    basis points (    %) |
| Spread Multiplier:                                                                                                                                                                                                                                                                                                                                                                        |   | N/A |
| Spread/Spread Multiplier Reset Option:                                                                                                                                                                                                                                                                                                                                                    |   | N/A |
| Optional Reset Dates (only applicable if option to reset spread or spread multiplier):                                                                                                                                                                                                                                                                                                    | N/A |
| Basis for Interest Rate Reset (only applicable if option to reset spread or spread multiplier):                                                                                                                                                                                                                                                                                           | N/A |
| Specified Currency:                                                                                                                                                                                                                                                                                                                                                                       |   | U.S. Dollars |
| Option to Elect Payment in U.S. Dollars  (only applicable if Specified Currency is other than U.S. Dollars):                                                                                                                                                                                                                                                                    | N/A |
| Authorized Denominations (only applicable if Specified Currency is other than U.S. Dollars):                                                                                                                                                                                                                                                                                              | N/A |
| Historical Exchange Rate (only applicable if Specified Currency is other than U.S. Dollars):                                                                                                                                                                                                                                                                                              | N/A |
| Maximum Interest Rate:                                                                                                                                                                                                                                                                                                                                                                    |   | N/A |
| Minimum Interest Rate:                                                                                                                                                                                                                                                                                                                                                                    |   | N/A |
| Initial Interest Rate:                                                                                                                                                                                                                                                                                                                                                                    |   | 3 Month USD LIBOR as of two (2) London Business Days prior to the Original Issue Date plus the Spread |
| Interest Reset Periods and Dates:                                                                                                                                                                                                                                                                                                                                                         |   | Quarterly on the   of March, June, September and December of each year prior to the Maturity Date |
| Interest Determination Dates:                                                                                                                                                                                                                                                                                                                                                             |   | Quarterly, two (2) London Business Days prior to each Interest Reset Date |
| Interest Payment Dates:                                                                                                                                                                                                                                                                                                                                                                   |   | Interest will be paid quarterly on the   of March, June, September and December of each year, commencing March   , 2019 and ending on the Maturity Date |
| Stated Maturity Extension Option:                                                                                                                                                                                                                                                                                                                                                         |   | N/A |
| Extension Period(s) and Final Maturity Date (only applicable if option to extend stated maturity):                                                                                                                                                                                                                                                                                        | N/A |
| Basis for Interest Rate During Extension Period (only applicable if option to extend stated maturity):                                                                                                                                                                                                                                                                                    | N/A |
| Original Issue Discount Note:                                                                                                                                                                                                                                                                                                                                                             |   | N/A |
| Total Amount of OID:                                                                                                                                                                                                                                                                                                                                                                      |   | N/A |
| Terms of Amortizing Notes:                                                                                                                                                                                                                                                                                                                                                                |   | N/A |
| Redemption Date(s):                                                                                                                                                                                                                                                                                                                                                                       |   | N/A |
| Redemption Price:                                                                                                                                                                                                                                                                                                                                                                         |   | N/A |
| Repayment Date(s):                                                                                                                                                                                                                                                                                                                                                                        |   | N/A |
| Repayment Price(s):                                                                                                                                                                                                                                                                                                                                                                       |   | N/A |
| Day Count Convention:                                                                                                                                                                                                                                                                                                                                                                     |   | Actual/360 |
| Denominations:                                                                                                                                                                                                                                                                                                                                                                            |   | Minimum denominations of $1,000 with increments of $1,000 thereafter |
| Joint Lead Managers & Bookrunners:                                                                                                                                                                                                                                                                                                                                                    |   | Citigroup Global Markets Inc. (       %) |
|                                                                                                                                                                                                                                                                                                                                                                                      |   | Merrill Lynch Pierce, Fenner & Smith                     Incorporated (       %) |
|                                                                                                                                                                                                                                                                                                                                                                                      |   | MUFG Securities Americas Inc. (         %) |
| Co-Managers:                                                                                                                                                                                                                                                                                                                                                                              |   |   |
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| Billing and Delivery Agent:                                                                                                                                                                                                                                                                                                                                                               |   |   |
| Exchange Rate Agent:                                                                                                                                                                                                                                                                                                                                                                      |   | U.S. Bank Trust National Association |
| Calculation Agent:                                                                                                                                                                                                                                                                                                                                                                        |   | U.S. Bank Trust National Association |
| CUSIP:                                                                                                                                                                                                                                                                                                                                                                                    |   |   |
| Other Provisions:                                                                                                                                                                                                                                                                                                                                                                         |   | Changes to LIBOR may adversely affect holders of the Notes.Regulators and law enforcement agencies from a number of governments have been conducting investigations relating to the calculation of LIBOR across a range of maturities and currencies, and certain financial institutions that are member banks surveyed by the British Bankers’ Association (the “BBA”) in setting daily LIBOR have entered into agreements with the U.S. Department of Justice, the U.S. Commodity Futures Trading Commission and/or the Financial Services Authority in order to resolve the investigations.  Since April 2013, the U.K. Financial Conduct Authority (“FCA”) has regulated LIBOR.Actions by the BBA, regulators or law enforcement agencies may result in changes to the manner in which LIBOR is determined or the establishment of alternative reference rates. For example, on July 27, 2017, the FCA announced that it intends to stop persuading or compelling banks to submit LIBOR rates after 2021. Furthermore, in the United States, efforts to identify a set of alternative U.S. dollar reference interest rates include proposals by the Alternative Reference Rates Committee of the Federal Reserve Board and the Federal Reserve Bank of New York.  A number of offerings of securities that include such an alternative rate have now been completed.  At this time, it is not possible to predict the effect of any such changes, any establishment of alternative reference rates or any other reforms to LIBOR that may be implemented in the United Kingdom, United States or elsewhere. Uncertainty as to the nature of such potential changes, alternative reference rates or other reforms and as to the continuation of LIBOR may adversely affect the trading market for the Notes, the interest on which is determined by reference to LIBOR. Although the Notes provide for alternative methods of calculating the interest rate payable on the Notes if LIBOR is not reported, which include requesting certain rates from major reference banks, determining a market accepted alternative rate or using LIBOR for the immediately preceding interest period, any of these alternative methods may result in interest rates and/or payments that are higher than, lower than or that do not otherwise correlate over time with the interest rates and/or payments that would have been made on the Notes if the LIBOR rate was available in its current form.Further, uncertainty as to the extent and manner in which the FCA regulates LIBOR and as to future changes with respect to LIBOR may adversely affect the current trading market for LIBOR-based securities and the value of your Notes.Calculation of LIBORThe LIBOR calculation provisions contained in the section “Description of Notes—Interest Rate—LIBOR Notes” in the Issuer’s Medium-Term Notes Prospectus Supplement dated March 30, 2017 are hereby replaced by the following:“(i)    The rate for deposits in the LIBOR currency having the index maturity designated by us in the applicable pricing supplement, as such rate is displayed on Reuters on the Designated LIBOR Page (as defined below) as of 11:00 a.m., London time, on such LIBOR interest determination date. If no such rate so appears, LIBOR on such LIBOR interest determination date will be determined in accordance with the provisions described in clause (ii) below.(ii)    With respect to a LIBOR interest determination date on which no rate is displayed on the Designated LIBOR Page as specified in clause (i) above, the calculation agent shall request the principal London offices of each of four major reference banks (which may include affiliates of the agents) in the London interbank market, as selected by the calculation agent, to provide the calculation agent with its offered quotation for deposits in the LIBOR currency for the period of the index maturity specified in the applicable pricing supplement, commencing on the related interest reset date, to prime banks in the London interbank market at approximately 11:00 a.m., London time, on such LIBOR interest determination date and in a principal amount that is representative of a single transaction in the LIBOR currency in such market at such time. If at least two such quotations are so provided, then LIBOR on such LIBOR interest determination date will be the arithmetic mean calculated by the calculation agent of such quotations. If fewer than two such quotations are so provided, then LIBOR on such LIBOR interest determination date will be the arithmetic mean calculated by the calculation agent of the rates quoted at approximately 11:00 a.m., in the applicable principal financial center, on such LIBOR interest determination date by three major banks (which may include affiliates of the agents) in such principal financial center selected by the calculation agent for loans in the LIBOR currency to leading European banks, having the index maturity specified in the applicable pricing supplement, commencing on the related interest reset date, and in a principal amount that is representative for a single transaction in the LIBOR currency in such market at such time; provided, however, that, subject to clause (iii) below, if the banks so selected by the calculation agent are not quoting as mentioned in this sentence, LIBOR determined as of such LIBOR interest determination date shall be LIBOR in effect on such LIBOR interest determination date.  (iii)   Notwithstanding clause (ii) above, if we or the calculation agent determine that LIBOR has been permanently discontinued, the calculation agent will use, as a substitute for LIBOR (the “Alternative Rate”) and for each future interest determination date, the alternative reference rate selected by a central bank, reserve bank, monetary authority or any similar institution (including any committee or working group thereof) that is consistent with accepted market practice. As part of such substitution, the calculation agent will, after consultation with us, make such adjustments (“Adjustments”) to the Alternative Rate or the spread thereon, as well as the business day convention, interest determination dates and related provisions and definitions, in each case that are consistent with accepted market practice for the use of such Alternative Rate for debt obligations such as the relevant series of floating rate notes. If the calculation agent determines, and following consultation with us, that there is no clear market consensus as to whether any rate has replaced LIBOR in customary market usage, (i) U.S. Bank Trust National Association shall have the right to resign as calculation agent in respect of the relevant series of floating rate notes and (ii) we will appoint, in our sole discretion, a new calculation agent to replace U.S. Bank Trust National Association, solely in its role as calculation agent in respect of the relevant series of floating rate notes, to determine the Alternative Rate and make any Adjustments thereon, and whose determinations will be binding on us, the trustee and the holders of the relevant series of floating rate notes. If, however, the calculation agent determines that LIBOR has been discontinued, but for any reason an Alternative Rate has not been determined, LIBOR determined as of such LIBOR interest determination date shall be LIBOR in effect on such LIBOR interest determination date.”Notice to European Economic Area InvestorsThis communication has been prepared on the basis that any offer of notes in any member state of the European Economic Area (“EEA”) which has implemented the Prospectus Directive (each, a “Relevant Member State”) will only be made to a legal entity which is a qualified investor under the Prospectus Directive (“Qualified Investors”). Accordingly any person making or intending to make an offer in that Relevant Member State of notes which are the subject of the offering contemplated in this communication may only do so with respect to Qualified Investors.  Neither the Issuer nor the managers have authorized, nor do they authorize, the making of any offer of notes other than to Qualified Investors. The expression “Prospectus Directive” means Directive 2003/71/EC (as amended, including by Directive 2010/73/EU), and includes any relevant implementing measure in the Relevant Member State.No PRIIPs KID – No PRIIPs key information document (KID) has been prepared as not available to retail in EEA.Notice to Swiss InvestorsThe notes may not be publicly offered, sold or advertised, directly or indirectly, in, into or from Switzerland and will not be listed on the SIX Swiss Exchange or any other offering or regulated trading facility in Switzerland. Neither this pricing supplement nor any accompanying prospectus supplement, prospectus or other marketing material constitute a prospectus as defined in article 652a or article 1156 of the Swiss Code of Obligations or a listing prospectus according to the Listing Rules of the SIX Swiss Exchange or any other regulated trading facility in Switzerland. Any resales of the notes by the underwriters thereof may only be undertaken on a private basis to selected individual investors  provided there is no publicity for the notes in Switzerland and no Swiss prospectus requirements are triggered. This pricing supplement and accompanying prospectus and prospectus supplement may not be copied, reproduced, distributed or passed on to others or otherwise made available in Switzerland without our prior written consent. By accepting this prospectus supplement and accompanying prospectus and prospectus supplement or by subscribing to the notes, investors are deemed to have acknowledged and agreed to abide by these restrictions. Investors are advised to consult with their financial, legal or tax advisers before investing in the notes. |
| CAPITALIZED TERMS USED HEREIN WHICH ARE DEFINED IN THE PROSPECTUS SUPPLEMENT SHALL HAVE THE MEANINGS ASCRIBED THERETO IN THE PROSPECTUS SUPPLEMENT. THE INTEREST RATES ON THE NOTES MAY BE CHANGED BY CATERPILLAR FINANCIAL SERVICES CORPORATION FROM TIME TO TIME, BUT ANY SUCH CHANGE WILL NOT AFFECT THE INTEREST RATE ON ANY NOTES OFFERED PRIOR TO THE EFFECTIVE DATE OF THE CHANGE. |