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Driven HR1 15w-50 Conventional Hot Rod & Classic Car OilCase of 12 Quarts Driven's HR1 Conventional 15w50 is an advanced petroleum motor oil that has been formulated to provide maximum protection and performance in classic engines. This race-proven oil technology includes the proper amount of "Fast Burn" Zinc (ZDDP) to ensure your engine has critical anti-wear protection. HR Oil also incorporates U.S. military spec corrosion inhibitors to provide unmatched protection against rust during extended storage periods. Made from a premium petroleum base, Driven HR1 Conventional 15w-50 is the choice of top engine builders when they need the trusted protection and economical cost of a conventional petroleum oil.Modern API-spec engine oils have done a great job of protecting emissions control equipment, however these modern oils have wreaked havoc on older engines. The reduction in emissions in modern cars has coincided with a reduction in traditional anti-wear additives (i.e. ZDDP) in modern oils, and that is bad news for your flat tappet camshaft. Driven's HR1 oil provides the needed protection for your hot rod or classic engine while also offering great storage and startup protection for vehicles that aren't frequently driven.Usage: HR1 Conventional 15w-50 is well suited for a variety of hot rods, muscle cars and vintage vehicles. This oil is an excellent choice for big block muscle cars, blown street rods, and engines with original seals. Good for flat tappet, overhead valve and roller camshaft engines. No ZDDP or other additives required.