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      01-24-2010, 06:18 PM   #16
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Drives: '07 335i coupe
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Interesting. I highly believe in zinc and phosphorus additives to oil, and a few oils such as royal purple, valvoline racing oils, and some turbo diesel oils contain. I use ZDDP additives in my drag cars for their protective qualities. Only way to know is to send your oil off to be tested. Good results!
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