ZDDP (Zinc Anti-Wear Additive)
ZDDP is a zinc and phosphorus anti-wear additive in engine oil that protects highly loaded parts such as flat-tappet camshafts.
What is ZDDP (Zinc Anti-Wear Additive)?
Modern oils have lower ZDDP to protect catalytic converters. Classic engines with flat tappets may need oil with more ZDDP. Special classic oils and additives are available. Running-in oils for rebuilt classic engines usually contain high ZDDP levels.
How it works
Under heat and pressure, ZDDP forms a protective film on metal surfaces.
Why it matters for your car
High-ZDDP oil may harm catalytic converters on modern cars. Use oil recommended for your engine type.
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