Description
Zinc dialkyldithiophosphate (ZDDP) is a commonly used anti-wear additive in engine oils. It is the zinc salt of dialkyl dithiophosphate.
The role of ZDDP is to form a protective layer on metal surfaces, especially in the high-pressure and high-temperature areas of the engine. This protective layer acts as a sacrificial layer where ZDDP molecules react with the metal surface to form a thin film. The film prevents direct metal-to-metal contact and reduces friction and wear between moving parts.
ZDDP also has excellent antioxidant and anti-corrosion properties. It helps inhibit the formation of sludge and varnish deposits, keeping your engine clean and maintaining proper oil flow. Additionally, ZDDP helps reduce wear on camshafts, lifters and other heavily loaded engine components.
However, it is worth noting that ZDDP levels in engine oils have been reduced in recent years due to concerns about its impact on catalytic converters in modern vehicles. High levels of phosphorus in exhaust gases can reduce catalytic converter performance. As a result, engine oils are now often formulated with lower levels of ZDDP and a combination of alternative anti-wear additives can be used to provide the necessary protection to engine components.
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