Quote:

FWIW Pennzoil 25W-50 Racing Oil has 1960ppm of Zinc and 1800ppm of phosporous. Quaker State Q Racing Synthetic is almost identical at 2000/1800

I haven't researched every oil available, but I've seen nothing higher than these two.

Dave



Dave,are those numbers from actual oil analysis or advertised figures ?
I had an analysis done on the Brad Penn,here are the numbers.

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