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Although the chart does flat out state that the 15w50 has 1200ppm phosphorus and 1300 ppm zinc, and is for racing and flat tappet application.
On another note. I've been using the Brad Penn 20w50 racing oil, does this have a detergent package or does BP expect that you will change oil more frequently as in a racing engine situation?
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S Reg 823 R Gruppe 246
1955 pre-A Carrera Speedster...x 1974 leichtbau..."Sascha"
"It makes me sad. Our cars were meant to be driven, not polished" - Ferry Porsche while surveying a PCA Parade concours field.
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