Originally Posted By: Bill H2
I have a 2001 Lexus with a 4.3 V8 (3UZFE). The engine has a VVT-I cam timing system that uses two sets of lobes per valve, but as far as I can tell, does not have roller cam followers. I use ZZDP additive for my older flat tappet engines, but I was thinking about the Lexus and wondering if I should us it that car also. I have been using GM EOS in my older car but have heard rumors that they changed the formula to delete the zinc. So, what should I be using?
There is about as much danger of overdoing it with ZDDP additives as doing without if not more. There is such a thing as too much of a good thing.
Most of the current motor oils seem to be hitting 700-800 ppm phosphorus.
Three ounces of EOS per quart would raise that to something in the range of 1,100 ppm, which is more than any engine should need in a non-racing application.
Red Line break-in additive is more concentrated than EOS, and you'd get the same result with about 3/4 ounce per quart.
However, it's worth noting that non-elemental anti-wear additives, and others such as calcium and boron, provide a pretty substantial substitute for the removed ZDDP.