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Castrol GTX Classic is specially formulated for classic/collector cars muscle cars hot rods and race cars. It is a high performance formula for push-rod flat tappet engines and performance cam applications. Its blended with high zinc and phosphorus content to help prevent premature aging wear and metal fatigue on engines with high tension valve springs or performance modifications that create high contact pressure and extreme internal temperatures. ZDDP anti-wear additives are heat activated so they provide wear protection in areas of increased friction and stress. When engine parts move during operation the sliding or rolling motion takes place on top of or within the ZDDP anti-wear film which reduces the metal to metal contact. This protection is especially important in engines with flat tappet camshafts or engines modified to increase horsepower. Enrollment is quick easy and FREE!