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    Engine oil mythology debunked, and ZDP content

    The API specification change to CJ-4 for 2007 has resulted in moderate zinc reduction from about 1,400 ppm to 1,200 ppm. And even at these slightly decreased levels, ROTELLA T 15W-40 conventional and 5W-40 synthetic still contain three to five times the amount of the desirable anti-wear...
  2. Tanner

    Engine oil mythology debunked, and ZDP content

    Those of us that participate in the air-cooled VW & Porsche engine community & build engines have had flat tappet cam wear issues typically attributed to a lessening of ZDDP in the oils... it isn't anecdotal - I just looked at a Type 4 VW/Porsche motor Wednesday that had no more than 10 hours on...
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