RWD - ZDDP Oil Additive

Volvo RWD 444-544 Forum

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ZDDP Oil Additive 444-544

This has been discussed ad nauseam on several forums including this one (what were you doing about a year ago?) and the conclusion cited by Phil and others is what I consider the most authoritative. The Valvoline/NAPA Fleet Plus DOES have the required level of ZDDP and is reasonable in price, especially the NAPA-branded oil, which is otherwise identical.
The B18/B20/B30 cam and lifter problem was sufficiently well documented when the engines were new that the American Petroleum Institute developed a "Volvo B20 Cam and Lifter Test" for oils. Thus far I have not been able to get a copy of the procedure. Maybe I should write to the API....
George Downs Bartlesville, Oklahoma


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New ZDDP Oil Additive [444-544]
posted by  59445  on Thu Dec 22 08:01 CST 2011 >

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