Supreme 7000™ Synthetic Plus™ Racing Oil 15W-40 is a premium quality, high zinc, multi-grade para-synthetic engine oil that is formulated to reduce friction and wear, increase engine efficiency and extend engine life in all types of high-performance gasoline engines including those that contain flat tappet cams and are turbocharged or supercharged. Supreme 7000™ Synthetic Plus Racing Oil 15W-40 can also be used in diesel powered multi-valve fuel injected engines typically found in light-duty diesel passenger cars and tractor pulling applications. (Not recommended for 4-cycle, ATV or motorcycle engines specifying a JASO MA or MB, NMMA FC or FC-W 4-cycle oils.)