Patent ID: 8034754

Claim:
A method of lubricating a driveline component during a break-in phase comprising adding a lubricating fluid to said driveline component, wherein the driveline component is an axle gear, and wherein the lubricating fluid is a lubricating composition comprising a basestock, a phosphorus-containing antiwear component, a nitrogen-containing compound selected from oil-soluble aliphatic amines in which the aliphatic group is a tertiary group, and a sulfur-containing extreme pressure component, said lubricating composition characterized by having an elemental phosphorus to nitrogen weight ratio of greater than or equal to 1.0, based on the weight of the entire lubricating composition, wherein at least 50 wt. % of said antiwear component is provided by at least one acid phosphate having the formula R 1 O(R 2 O)P(O)OH, where R 1 is hydrogen or hydrocarbyl and R 2 is hydrocarbyl, further characterized by a sulfur content of greater than or equal to 1.5 wt. %, and wherein the hydrocarbyl groups of R 1 and R 2 are branched C 1 -C 30 hydrocarbyls.