Document:

<PAGE>

                                                                    Exhibit 4.14

                         SECOND SUPPLEMENTAL INDENTURE

                                      to

                                   INDENTURE
                           Dated as of June 29, 1998

                                     among

                           FEDERAL-MOGUL CORPORATION

                                  as Issuer,

                 THE GUARANTORS PARTY HERETO FROM TIME TO TIME

                                 as Guarantors

                                      and

                             THE BANK OF New York

                                  as Trustees

                           Dated as of July 21, 1998
<PAGE>

     SECOND SUPPLEMENTAL INDENTURE, dated as of July 21, 1998 among Federal-
Mogul Corporation, a Michigan corporation, as issuer (the "Company") the
companies listed on the signature pages of the Indenture (as hereinafter
defined) that are subsidiaries of the Company (the "Original Guarantors"), F-M
UK Holdings Limited, a wholly-owned subsidiary of the Company (the "Additional
Guarantor" and together with the Original Guarantors, the "Guarantors") and The
Bank of New York, a New York banking corporation, as trustee (the "Trustee").

                                   RECITALS

     The Company and the Original Guarantors have duly executed and delivered an
Indenture (as such may be amended, supplemented or modified from time to time,
the "Indenture") dated, as of June 29, 1998, providing for the issuance from
time to time of its unsecured debentures, notes or other evidences of
indebtedness ("Securities") to be issued in one or more series.

     The Company and the Original Guarantors have duly executed and delivered a
First Supplemental Indenture dated as of June 30, 1998 (the "First Supplemental
Indenture"), providing for the issuance of three separate series of Securities
designated as the Company's 7 1/2% Notes due July 1, 2004 (the "7 1/2% Notes"),
7 1/4% Notes due July 1, 2006 (the "7 1/4% Notes") and 7 7/8% Notes due July 1,
2010 (the "7 7/8% Notes," together with the 7 1/2% Notes and the 7 1/4% Notes,
the "Notes"), respectively, in the aggregate principal amount of $250,000,000 in
the case of the 7 1/2% Notes, $400,000,000 in the case of the 7 1/4% Notes, and
$350,000,000 in the case of the 7 7/8% Notes, each series guaranteed by each of
the Original Guarantors, on the terms set forth therein.

     The Additional Guarantor desires to guarantee each of the aforementioned
series of Securities and each additional series hereafter issued pursuant to the
Indenture, such guarantee to be on the terms set forth herein.

     Section 8.1 of the Indenture provides that the Company, the Guarantors and
the Trustee may at any time and from time to time enter into one or more
indentures supplemental to the Indenture to subject each such subsidiary of the
Company that becomes a guarantor under the Senior Credit Agreement (or any other
credit agreement renewing, refunding, replacing, restating, refinancing or
extending the Senior Credit Agreement), to the provisions of the Indenture as a
Guarantor as permitted by Section 12.6 of the Indenture.

     All things necessary to make this Second Supplemental Indenture a valid
agreement of the Company, the Guarantors and the Trustee, in accordance with its
terms, have been done.

     For and in consideration of the premises and the purchase of the Securities
by the Holders thereof, it is mutually covenanted and agreed as follows for the
equal and ratable benefit of the Holders of the Securities:

                                      -2-
<PAGE>

                                   ARTICLE 1

            DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

     Section 1.1.   Definitions.  For all purposes of this Second Supplemental
                    -----------
Indenture, capitalized terms used herein without definition shall have the
meanings specified in the Indenture.

     Section 1.2.   Headings.  The Article and Section headings herein are for
                    --------
convenience only and shall not affect the construction hereof.

     Section 1.3.   Successors and Assigns.  This Second Supplemental Indenture
                    ----------------------
shall be binding upon the Company and the Guarantors and their respective
successors and assigns and shall inure to the benefit of the Trustee and the
Holders and, in the event of any transfer or assignment of rights by any Holder
or the Trustee, the rights and privileges conferred upon that party in the
Indenture and this Second Supplemental Indenture and in the Securities shall
automatically extend to and be vested in such transferee or assignee, all
subject to the conditions of the Indenture.  This Second Supplemental Indenture
shall be binding upon the Trustee and its successors and assigns.

     Section 1.4.   Ratification of Indenture; Supplemental Indentures Part of
                    ----------------------------------------------------------
Indenture. Except as expressly amended hereby, the Indenture is in all respects
---------
ratified and confirmed and all the terms, conditions and provisions thereof
shall remain in full force and effect.  This Second Supplemental Indenture shall
form a part of the Indenture for all purposes, and every Holder of  Securities
heretofore or hereafter authenticated and delivered shall be bound hereby.

     Section 1.5.   Governing Law.  THIS SECOND SUPPLEMENTAL INDENTURE AND THE
                    -------------
GUARANTEE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK.

     Section 1.6.   Counterparts.  This Second Supplemental Indenture may be
                    ------------
executed in any number of counterparts and by telecopier, each of which shall be
an original, but such counterparts shall together constitute but one and the
same instrument.

                                   ARTICLE 2

             SCOPE AND TERMS OF THIS SECOND SUPPLEMENTAL INDENTURE

     Section 2.1.   Scope.  The changes, modifications and supplements to the
                    -----
Indenture effected by this Second Supplemental Indenture shall be applicable
with respect to, and govern the terms of, the Securities heretofore and
hereafter issued pursuant to this Indenture.

                                      -3-
<PAGE>

     Section 2.2.   Additional Guarantor.  Subject to the provisions of Article
                    --------------------
12 of the Indenture (including provisions for the release of a Guarantor), the
Additional Guarantor shall be subject to the provisions of the Indenture as
Guarantor of the Securities.

     IN WITNESS WHEREOF, the parties hereto have caused this Second Supplemental
Indenture to be duly executed as of the day and year first above written.

                                   FEDERAL-MOGUL CORPORATION

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   FEDERAL-MOGUL DUTCH HOLDINGS INC.,
                                   as Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   FEDERAL-MOGUL GLOBAL INC., as Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   FEDERAL-MOGUL U.K. HOLDINGS INC., as
                                   Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   CARTER AUTOMOTIVE COMPANY, INC., as
                                   Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   FEDERAL-MOGUL VENTURE CORPORATION,
                                   as Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                      -4-
<PAGE>

                                   FEDERAL-MOGUL WORLD WIDE, INC., as
                                   Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   FEDERAL-MOGUL GLOBAL PROPERTIES, INC.,
                                   as Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   FELT PRODUCTS MFG. CO., as Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   FEL-PRO MANAGEMENT CO., as Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   FEL-PRO CHEMICAL PRODUCTS L.P., as
                                   Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   F-M UK HOLDINGS LIMITED, as Guarantor

                                   By: _______________________________________
                                       Name:
                                       Title:

                                   THE BANK OF NEW YORK, as Trustee

                                   By: _______________________________________
                                       Name:
                                       Title:

                                      -5-<PAGE>

                                                                    Exhibit 4.15

                         THIRD SUPPLEMENTAL INDENTURE

                                      To

                                   INDENTURE
                           Dated as of June 29, 1998

                                     among

                           FEDERAL-MOGUL CORPORATION

                                  as Issuer,

                 THE GUARANTORS PARTY HERETO FROM TIME TO TIME

                                 as Guarantors

                                      and

                             THE BANK OF NEW YORK

                                  as Trustee

                          Dated as of October 9, 1998
<PAGE>

          THIRD SUPPLEMENTAL INDENTURE, dated as of October 9, 1998 among
Federal-Mogul Corporation, a Michigan corporation, as issuer (the "Company"),
the companies listed on the signature pages of the Indenture (as hereinafter
defined), as supplemented, that are subsidiaries of the Company (the "Original
Guarantors"), Champion Spark Plug Company, Cooper Automotive Products, Inc.,
Cooper Automotive Company, Cooper A&S Company, Moog Automotive Products, Inc.,
Moog Automotive Batesville, Inc., Moog Redevelopment Corporation, Moog
Automotive Company, Champion Aviation, Inc. and Champion InterAmericana, Ltd.,
each a wholly-owned subsidiary of the Company (the "Additional Guarantors" and
together with the Original Guarantors, the "Guarantor") and the Bank of New
York, a New York banking corporation, as trustee (the "Trustee").

                                   RECITALS

          The Company and The Original Guarantors have duly executed and
delivered an Indenture (as such may be amended, supplemented or modified from
time to time, the "Indenture") dated as of June 29, 1998, providing for issuance
from time to time of its unsecured debentures, notes or other evidences of
indebtedness ("Securities") to be issued  in one or more series.

The Company and the Original Guarantors have duly executed and delivered a First
Supplemental Indenture dated as of June 30, 1998 (the  "First Supplemental
Indenture"), providing for the issuance of three separate series of Securities
designated as the Company's 7  1/2% Notes due July 1, 2004 (the "7  1/2%
Notes"), 7  3/4% Notes due by July 1, 2006 (the "7  3/4% Notes") and 7 7/8%
Notes due July 1, 2010 (the "7 7/8% Notes", together with the 7  1/2% Notes and
the 7  1/4% Notes, the "Notes"), respectively, in the aggregate principal amount
of $250,000,000 in the case of the 7  1/2% Notes, $400,000,000 in the case of
the7  3/4% Notes, and the $350,000,000 in the case of the 7 7/8% Notes, each
series guaranteed by each of the Original Guarantors, on the terms set forth
therein.

          The Additional Guarantors desire to guarantee each of the
aforementioned series of Securities and each additional series hereafter issued
pursuant to the Indenture, such guarantee to be on the terms set forth therein.

          Section 8.1 of the Indenture provides that the Company, the Guarantors
and the Trustee may at any time and from time to time enter into one or more
indentures supplemental to the Indenture to subject each such subsidiary of the
Company that becomes a guarantor under the Senior Credit Agreement (or any other
credit agreement renewing, refunding, replacing, restating, refinancing or
extending the Senior Credit Agreement), to the provisions of the indenture as a
Guarantor as permitted by Section 12.6 of the Indenture.
<PAGE>

          All things necessary to make this Third Supplemental Indenture a valid
agreement of the Company, the Guarantors and the Trustee, in accordance with its
terms, have been done.

          For and in consideration of the premises and the purchase of the
Securities by the Holders thereof, it is mutually covenanted and agreed as
follows for the equal and ratabel benefit of the Holders of the Securities:

                                   ARTICLE I

            DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

          Section 1.1.  Definitions.  For all purposes of this Third
                        -----------
Supplemental Indenture, capitalized terms used herein without definition shall
have the meanings specified in the Indenture.

          Section 1.2.  Heading.  The Article and Section headings herein are
                        -------
for convenience only and shall not affect the construction hereof.

          Section 1.3.  Successors and Assigns.  This Third Supplemental
                        ----------------------
Indenture shall be binding upon the Company and the Guarantors and their
respective successors and assigns and shall inure to the benefit of the Trustee
and the Holders and, in the event of any transfer or assignment of rights by any
Holder or the Trustee, the rights and privileges conferred upon that party in
the Indenture and this Third Supplemental Indenture and in the Securities shall
automatically extend to and be vested in such transferee or assignee, all
subject to the conditions of the Indenture.  This Third Supplemental Indenture
shall be binding upon the Trustee and its successors and assigns.

          Section 1.4.  Ratification of Indenture: Supplemental Indenture Part
                        ------------------------------------------------------
of Indenture.  Except as expressly amended hereby, the Indenture is in all
------------
respects ratified and confirmed and all the terms, conditions, and provisions
thereof shall remain in full force and effect.  This Third Supplemental
Indenture shall form a part of the Indenture for all purposes, and every Holder
of Securities heretofore or hereafter authenticated and delivered shall be bound
hereby.

          Section 1.5.  Governing Law. THIS THIRD SUPPLEMENTAL INDENTURE AND THE
                        -------------
GUARANTEE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWA OF THE
STATE OF NEW YORK.

          Section 1.6.  Counterparts.  This Third Supplemental Indenture may be
                        ------------
executed in any number of counterparts and by telecopier, each of which shall be
an original, but such counterparts shall together constitute but one and the
same instrument.
<PAGE>

                                   ARTICLE 2

             SCOPE AND TERMS OF THIS THIRD SUPPLEMENTAL INDENTURE

          Section 2.1  Scope.  The changes, modifications and supplements to the
                       -----
Indenture effected by this Third Supplemental Indenture shall be applicable with
respect to, and govern the terms of, the Securities heretofore and hereafter
issued pursuant to the Indenture.

          Section 2.2  Additional Guarantors.  Subject to the provisions of
                       ---------------------
Article 12 of the Indenture (including provisions for the release of a
Guarantor), the Additional Guarantors shall be subject to the provisions of the
Indenture as Guarantors of the Securities.
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Third
Supplemental Indenture to be duly executed as of the day and year first above
written.

                                 FEDERAL-MOGUL CORPORATION

                                 By: __________________________________________
                                       Name:
                                       Title:

                                 FEDERAL-MOGUL DUTCH HOLDINGS INC.,
                                 as Guarantor

                                 By: __________________________________________
                                     Name:
                                     Title:

                                 FEDERAL-MOGUL GLOBAL INC., as
                                 Guarantor

                                 By: __________________________________________
                                     Name:
                                     Title:

                                 FEDERAL-MOGUL U.K. HOLDINGS INC., as Guarantor

                                 By: __________________________________________
                                     Name:
                                     Title:

                                 CARTER AUTOMOTIVE COMPANY, INC., as
                                 Guarantor

                                 By: __________________________________________
                                     Name:
                                     Title:
<PAGE>

                                        FEDERAL-MOGUL VENTURE CORPORTATION,
                                        as Guarantor

                                        By: ___________________________________
                                            Name:
                                            Title:

                                        FEDERAL-MOGUL WORLD WIDE, INC.,
                                        as Guarantor

                                        By: ___________________________________
                                            Name:
                                            Title:

                                        FEDERAL-MOGUL GLOBAL PROPERTIES, INC.,
                                        as Guarantor

                                        By: ___________________________________
                                            Name:
                                            Title:

                                        FELT PRODUCTS MFG. CO., as Guarantor

                                        By: ___________________________________
                                            Name:
                                            Title:

                                        FEL-PRO MANAGEMENT CO., as Guarantor

                                        By: ___________________________________
                                            Name:
                                            Title:
<PAGE>

                                        F-M UK HOLDINGS LIMITED, as Guarantor

                                        By: ___________________________________
                                            Name:
                                            Title:

                                        CHAMPION SPARK PLUG COMPANY, as
                                        Guarantor

                                        By: ___________________________________
                                            Name:
                                            Title:

                                        COOPER AUTOMOTIVE PRODUCTS, INC.,
                                        as Guarantor

                                        By: ___________________________________
                                            Name:
                                            Title:

                                        COOPER AUTOMOTIVE COMPANY, as Guarantor

                                        By: ___________________________________
                                            Name:
                                            Title:

                                        COOPER A&S COMPANY, as Guarantor

                                        By: ___________________________________
                                            Name:
                                            Title:
<PAGE>

                                     MOOG AUTOMOTIVE PRODUCTS, INC., as
                                     Guarantor

                                     By: ______________________________________
                                         Name:
                                         Title:

                                     MOOG AUTOMOTIVE BATESVILLE, INC.,
                                     as Guarantor

                                     By: ______________________________________
                                         Name:
                                         Title:

                                     MOOG REDEVELOPMENT CORPORATION,
                                     as Guarantor

                                     By: ______________________________________
                                         Name:
                                         Title:

                                     MOOG AUTOMOTIVE COMPANY, as Guarantor

                                     By: ______________________________________
                                         Name:
                                         Title:

                                     CHAMPION AVIATION, INC., as Guarantor

                                     By: ______________________________________
                                         Name:
                                         Title:

                                     CHAMPION INTEAMERICA, LTD., as Guarantor

                                     By: ______________________________________
                                         Name:
                                         Title:
<PAGE>

                                        THE BANK OF NEW YORK, as Trustee

                                        By: ___________________________________
                                            Title:

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