<VV>High Mileage Oil for our engines

BobHelt at aol.com BobHelt at aol.com
Sun Dec 9 01:18:17 EST 2007

In a message dated 12/8/2007 8:06:52 PM US Mountain Standard Time,  
corvair at fnader.com writes:

This is  a complicated issue, and the deposits depend on the specific 
ZDDP  chemistry and the finished oil formulation. The industry was 
unsuccessful  in designing an engine test for an oil’s catalytic 
converter deposit  forming tendencies. Therefore, the auto manufacturers 
set an arbitrary  limit for motor oil of 0.1 percent phosphorus.

Well, this is true for SJ and SL rated oils only.  SM oils have no  upper 
limit and GF-4 oils have a limit of 0.08%.
Bob Helt

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