e.Energy Conserving Oils. Oils marketed as "Energy Conserving" are intended to improve fuel economy inpassenger car engines. Some of these oils contain friction modifier chemical additives. One additive,molybdenum dithioposphate, has been implicated in copper corrosion problems in some heavy- duty dieselengines. Therefore, until further information is available, do not use an "Energy Conserving" oil containingmolybdenum dithiophosphate in any IH built engine. In addition, some "Energy Conserving" oils meet only APICategory SF for spark ignition engines, and do not meet the oil quality requirements for diesel engines.4-4
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