Keeping our vintage hot rods protected during storage times and inactivity makes many collectors anxious when it is time to be street ready. Older engines were built with flat-tappet cams and splash-lubricated components which when stored for long periods of time can be exposed to moisture creating humidity-driven rust and corrosion. Zinc dialkyldithiophosphate (ZDDP) is commonly used in motor oil as an additive that provides anti-wear protection and minimizes lubricant breakdown.
Read more about the benefits of Zinc dialkyldithiophosphate (ZDDP) in AMSOIL synthetic motor oils here.