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Re: Oil confusion, please help!
Quote:
Originally Posted by bigmac73
That is not good.... do u have some documentation to support ? I might have to swap to royal purple
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Does the oil have a API designation? If so they have removed the majority of ZDDP. The standards changed so in order to maintain their rating they removed the zinc. Zinc kills catalytic convertors and now that diesel trucks have them the zinc had to go.
Here are some links if your interested.
https://www.speed-talk.com/forum/viewtopic.php?t=28365
https://pantera.infopop.cc/topic/eng...esting-results
https://www.bobistheoilguy.com
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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