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SignUp Now![quote="HighMileage, ]So how much ZDDP would be too much?
Quote: "At about 0.20% phosphorus the ZDP started attacking the grain boundaries in the iron, resulting in camshaft spalling."
Source: http://forums.aaca.org/attachments/...c-other-myths-engine-oil-mythology-2-2007.pdf
Mike Regarding your VR-1 findings ^ ^ ^ How short was it? I've been adding the 1/2 bottle to my VR-1 as well...but..i run a flatty with a lot (115Lbs) of spring. sounds like a full bottle may be advised...which goes back to the original topic of " how much is too much ?
Ok,
turbocamino1 and turbo nasty. Some of my testing was on a roller engine and I had upwards of 2200 PPM of zinc when VR-1 racing oil was tested after 1000 miles of driving and track passes. This was with one full bottle of ZDDP in it. Put 38,000 miles on that engine and when I sold it it still looked new inside and NO issues what so ever. Now I only put half a bottle in my roller engine. 10,000 miles and going strong.