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Fellas, that "rumor" isn't completely right, but its not completely wrong, either. Nobody in government "mandated" the removal of zinc, but they did mandate catalytic converters on diesel engined passenger vehicles and pick-ups starting in 2008. And catalytic converters don't like zinc. So with...

Originally Posted By: TallPaul Hey, that's great if they are making a break in additive with 9000 zinc and 7500 phos. 10 ounces would boost a 6 quart system by about 400 ppm zinc. Has any one here tried ZBoost? (www.MotorHeadOil.com)They claim that their 1 ounce bottle will boost a 6 quart...

I have been using Motorhead Classic in six collector cars for nearly a year now. My mechanic, who is a racing engine builder, recommended it. It isn't as expensive as all that, because I buy 8 gallons at a time, and the price drops to only $12.50 per gallon. All of the oil companies will tell...