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Zinc Dialkyl DithiophosphatesThe anti-wear additive simply referred to as zinc by most car enthusiasts is actually short for Zinc Dialkyl Dithiophosphates or ZDDP. Looking for online definition of ZDDP or what ZDDP stands for? ZDDP is listed in the World's largest and most authoritative dictionary database of abbreviations. ZDDP in Duckhams Classic Motor Oil – What Does it All Mean? As one of the biggest and most mis-understood buzzwords regarding oils in. Zinc dialkyldithiophosphate (ZDDP) is the most commonly used anti-wear additive in motor oils. When the EPA turned its attention to a popular lubricant, zinc dialkyl dithiophosphate, or ZDDP, that was a bridge too far. For older vehicles with flat tappet and hydraulic flat tappet cams they need the ZDDP to protect the cam and lifters steeper ramp.