Lubricating oil composition

A method for improving the anti-wear protection of an internal combustion engine comprising the steps of:

• (1) adding a lubricating oil composition which exhibits improved fuel economy and fuel economy retention properties to an engine, said composition comprising:
• (a) an oil of lubricating viscosity;
• (b) at least one calcium detergent;
• (c) at least one oil soluble molybdenum compound;
• (d) at least one nitrogen containing friction modifier;
• and
• (e) at least one zinc dihydrocarbyldithiophosphate compound,
• wherein said composition has a NOACK volatility of about 15.5 wt. % or less, from about 0.058 to 0.58 wt. % calcium from the calcium detergent, molybdenum in an amount up to about 350 ppm from the molybdenum compound, and phosphorus in an amount up to about 0.1 wt. % from the zinc dihydrocarbyldithiophosphate compound;
• and (2) operating the engine, thereby obtaining an average cam lobe wear of less than 100 microns as measured by the ASTM Sequence IVA Test.

A concentrate for blending with an oil of lubricating viscosity, said concentrate comprising:

• (a) at least one calcium detergent;
• (b) at least one oil soluble molybdenum compound;
• (c) at least one nitrogen containing friction modifier;
• and
• (d) at least one zinc dihydrocarbyldithiophosphate compound, to provide a lubricating oil composition having a NOACK volatility of about 15.5 wt. % or less, from about 0.058 to 0.58 wt. % calcium from the calcium detergent, molybdenum in an amount up to about 350 ppm from the molybdenum compound, and phosphorus in an amount up to about 0.1 wt. % from the zinc dihydrocarbyldithiophosphate compound.