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  #11 (permalink)  
Old 02-04-2011, 10:57 AM
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Quote:
Originally Posted by madmaxx View Post
Mobil 1 15w 50 does not meet the SJ rating and therefore has the added zinc and phosphorous. Zinc and Phosphorous kill emission components, cat converters etc. You will also notice Royal Purple does not meet them either.
Royal Purple states that if you want the added ZDDP, use their "racing" oil which is the same but with added ZDDP. I use their regular street oil and add my own ZDDP.


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