1990-10-01

Fuel Sulfur Effects on Diesel Engine Lubrication 902175

The Environmental Protection Agency will require a reduction in U.S. diesel particulate standards in 1991. To comply with this, the OEM's must modify engine design and ask petroleum refiners to reduce fuel sulfur levels to less than 0.05%. This reduction could have a dramatic impact on an engine's lubricant and possibly its performance. The durability and particulate emission stability of new engines designed to use low sulfur fuel should be related to lubricant performance and protection. Performance with low sulfur fuel must also be acceptable with equipment in service today. Laboratory evaluations of lubricant performance in current equipment were conducted with the Caterpillar 1G2 and various multicylinder diesel tests used for API CE certification. Performance differences attributable to both fuel sulfur and lubricant formulation variations have been identified and will be discussed.

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