learn more


Cam Assembly

learn more

The Science behind ZDDPlus

ZDDPlus is the original, best researched and documented cam wear solution available.

Tech Briefs & Guides


ZDDPlus in Action

The sliding cam-to-cam-follower interface in a non-roller lifter engine requires a special anti-wear additive, which has historically been ZDDP. After 70+ years of positive protection afforded by ZDDP, emission system changes are forcing a reduction in the amount of ZDDP in motor oils, leaving your classic or performance car at risk of premature cam and lifter wear. When a single 4 oz bottle of ZDDPlus™ is added to a normal 5-quart oil change, you will restore the proper amount of ZDDP that was found in into pre-1996 oils. Using ZDDPlus™ affords you total control over the characteristics of the oil in the engine by allowing you to use the full 5 quarts of high-grade automotive oil of your choice.

zddplus-bio-thumb“We use ZPlus on all of our Flat Tappet built motors.”
– Ron Hutter
Hutter Race Engines
zddplus-bio2-thumb“ZDDPlus is the best insurance to protect your classic or high-performance flat-tappet engine!”
— “Big Daddy” Don Garlits
NHRA’s #1 Drag Racer of All Time