Afton Chemical Corporation

Leslie Schmid

Kristi Engelman

Ken Garelick

A lubricating oil composition and method for controlling timing chain stretch, wherein the composition contains greater than 50 wt. % of base oil, zinc dialkyl dithiophosphate(s) to provide 350-2200 ppm zinc, molybdenum-containing compound(s) to provide &#x3e;1-3000 ppm molybdenum, and magnesium-containing detergent(s) to provide &#x3c;2050 ppm magnesium, all based on the total weight of the composition. The composition has a total TBN of less than 7.5 mg KOH/g, measured by ASTM D-2896 and a weight ratio of ppm of zinc from zinc dialkyl dithiophosphate(s) to ppm of molybdenum from molybdenum-containing compound(s) of &#x3c;10. The method employs the lubricating oil composition to control timing chain stretch to a level of 0.1% or less.

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Richmond, VA, United States of America

Leslie Schmid