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Message: <blockquote data-quote="OlBrownTruck" data-source="post: 3957467" data-attributes="member: 41331"><p>A lot of modern engines are overhead cam and the valvetrain incorporates roller technology. Even more conventional engines use roller cams. This cuts down on friction inside the engine. Consequently, a lot of oils are missing an additive called zinc dialkyldithiophosphate (ZDDP), an anti friction additive. Older engines with flat tappet cams need this additive to prevent premature cam/lifter wear. Using the modern oils in older engines sometimes results in this premature cam and valvetrain wear. This additive is available for purchase and should be used when using the modern oils in older engines.</p></blockquote><p></p>