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AssigneeEthyl Petroleum Additives, Inc.
InventorsJulia C. Poat, Graeme M. Wallace, David Kenvyn Walters, Ian Macpherson
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In a motor vehicle, especially a heavy duty motor vehicle, having a transmission equipped with at least one cone-type synchronizer and an axle or differential gearing, the same lubricant is used for both such mechanisms. The lubricant has a viscosity grade level of from SAE 75W90 to SAE 85W140 and comprises base oil containing at least (i) Mannich base ashless dispersant; (ii) metal-free, sulphur-containing antiwear and/or extreme pressure agent; (iii) metal-free, phosphorus-containing and nitrogen-containing antiwear and/or extreme pressure agent; and (iv) overbased alkali or alkaline earth metal carboxylate, sulphonate or sulphurized phenate having a TBN of at least 145. The lubricant contains at most, if any, 100 ppm of metal as one or more metal-containing additive components other than (iv).
A method of operating a motor vehicle having (A) a manual transmission equipped with at least one cone-type synchronizer and (B) differential axle gearing, which comprises employing the same lubricant composition to lubricate both said mechanisms (A) and (B), said lubricant composition having a viscosity grade level of from SAE 75W90 to SAE 85W140 and comprising base oil, and minor amounts of at least the following components:
A method of lubricating the driveline of a motor vehicle powered by an internal combustion engine and having a driveline comprising (A) a manual transmission equipped with at least one cone-type synchronizer encased in a housing therefor constructed and adapted to hold a fluid lubricant for said transmission, and (B) differential axle gearing encased in a housing therefor constructed and adapted to hold a fluid lubricant for said gearing, which method comprises (I) introducing into both of said housings as the lubricants for said transmission and for said gearing, the requisite respective amounts of the same lubricant composition, and (II) sealing said housings so that said lubricant composition is kept therein during ensuing operation of said vehicle, said lubricant composition having a viscosity grade level of from SAE 75W90 to SAE 85W140 and comprising base oil, and minor amounts of at least the following components:
Dependencies are inferred from the claim text.