Lubricant compositions

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A method for improving corrosion protection and friction coefficient in an engine or other mechanical component lubricated with a lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising a lubricating oil base stock as a major component;

• and a mixture of (i) at least one molybdenum dithiophosphate having a molybdenum to sulfur ratio from 1 to less than 1.1, and (ii) at least one borated ester, as a minor component;
• wherein corrosion protection and friction coefficient are improved as compared to corrosion protection and friction coefficient achieved using a lubricating oil containing a minor component other than the mixture of (i) at least one molybdenum dithiophosphate having a molybdenum to sulfur ratio from 1 to less than 1.1, and (ii) at least one borated ester.

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A lubricating oil having a composition comprising a lubricating oil base stock as a major component;

• and a mixture of (i) at least one molybdenum dithiophosphate having a molybdenum to sulfur ratio from 1 to less than 1.1, and (ii) at least one borated ester, as a minor component;
• wherein corrosion protection and friction coefficient are improved in an engine or other mechanical component lubricated with the lubricating oil, as compared to corrosion protection and friction coefficient achieved using a lubricating oil containing a minor component other than the mixture of (i) at least one molybdenum dithiophosphate having a molybdenum to sulfur ratio from 1 to less than 1.1, and (ii) at least one borated ester.