Patent ID: 8747650

Claim:
An automotive engine lubricant composition, which comprises an admixture of: (a) a major amount of one or more Fischer-Tropsch Base Oils (FTBOs), wherein the major amount of said one or more FTBOs is greater than about 60 wt. % based on the total weight of said composition; (b) one or more ashless dispersants present in an amount from about 0.5 wt. % to about 10 wt. % of based on the total weight of the composition; (c) a mixture of a low overbased calcium sulfonate detergent having a total base number (TBN) of less than 100 and a high overbased calcium phenate detergent having a TBN of greater than 100, wherein the mixture of the low-overbased calcium sulfonate detergent and the high-overbased calcium phenate detergent is present from about 0.05 mM to about 16 mM in said lubricant composition; (d) one or more metal dihydrocarbyldithiophosphate anti-wear additives present in an amount that contributes about 0.03 to about 0.075 wt. % of phosphorus to the composition; and (e) from about 0.20 to about 0.80 wt. of a phenolic antioxidant, or an aminic antioxidant, or a combination thereof, based on the total weight of the lubricant composition; wherein said automotive engine lubricant composition has a sulfur content of at or below about 0.3 wt. %, a phosphorus content of at or below about 0.08 wt. %, and a sulfated ash content of at or below about 1.0 wt. %, based on the total weight of said lubricant composition, and wherein the one or more FTBOs each has paraffinic hydrocarbon components with less than about 12 alkyl branches per 100 carbons.