Goose52 Posted September 24, 2007 Share Posted September 24, 2007 The STP four cylinder oil treatment and CD2 High Perf Oil Boost (both in the red bottle) have more than the required amount in PPM of ZDDP when mixed with five qts. of oil. Picked up a bottle of the 4-cyl treatment over the weekend and added it to the crankcase of my L-28. I just changed oil about 300 miles ago and didn't want to wait for the next oil change. I have one of the Schneider cams with the bad rep about the cam lobe wear. No problems so far but I only have about 3,000 miles on the cam. I hope this STP additive, and later, using Valvoline racing oil, will help ... Quote Link to comment Share on other sites More sharing options...
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