KEYWORDS

Friction Modifiers, Gasoline Engine Oils, Thermal Stability

IMPROVING FUEL ECONOMY WITH MoDTC WITHOUT INCREASING TEOST33C DEPOSIT

Efforts to reduce CO2 emissions have made Fuel Economy Improvement (FEI) a major issue for automotive manufactures. Low friction engine oils are known to improve this matter. The combination of lower viscosity and effective friction reduction technologies is key to assist FEI. MoDTC (Molybdenum dialkyldithiocarbamate) is one of the most effective FM components in boundary lubrication. The effect of MoDTC for FEI was evaluated and the maximum friction reducing performance was improved by more than 10% on the motored engine test and 1% FEI was obtained on the Chassis Dynamo Test. Though negative results of MoDTC on bench tests for boosted gasoline engine oils (TEOST33C) have been seen, further research shows that the properties of base oil has a large impact in deposit generation. As a result, has become known that adding high doses of MoDTC to engine oil is possible without increasing deposits.

AUTHORS

Kenji Yamamto and Yukiya Moriizumi, Surface Specialties Department, ADEKA Corporation, Tokyo, Japan