There is a guy (an engineer for a bearing manufacturer) on a board I used to frequent that has been going on about ZDDP for years. His position was that the STP 4-cylinder formula (red bottle) was better than the blue bottle because it had less "other stuff" and the same amount of ZDDP. Can anyone confirm/refute this?
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- Jeremy
67 Firebird, 400, 4-speed
69 Mustang 5.0L HO EFI, AOD
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