Quote:
Originally Posted by Triple Jim
Yes, I've read a lot about ZDDP, and have bought Valvoline VR1 for a particular application I have. I've also run low ZDDP oil in non-roller engines for many thousands of miles with no problems. The "certain conditions" you wrote is probably a good qualifier. Although I put VR1 in my 250 last time I changed the oil, I'm temped to run low ZDDP oil next time just so I can report my findings after my next valve adjustment.
Have you actually seen in person cam and lifter galling that you can attribute to low ZDDP oil? I had a BBC cam wipe a couple lobes once, but it was way before ZDDP levels were lowered, and it was a triple valve spring setup.
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Why would you ever do that?
I've seen messed-up cams before, but not in any of my engines because I'm careful about maintenance and the products i use.
It's all in who you trust/believe. Don't take my word for it.
http://www.enginebuildermag.com/2015...or-oil-issues/
"Reducing ZDDP in motor oils created some serious cam lobe and lifter wear issues in older engines with flat tappet cams – especially those with hi-lift performance cams and stiffer valve springs. One fix was to run diesel motor oil in these engines to prevent cam wear. The higher level of ZDDP in diesel oils provided the same anti-wear protection as the older gasoline motor oils."
https://generalaviationnews.com/2013...-can-hurt-you/
"In a flat tappet lifter engine, the point where the camshaft contacts the lifter is the highest load point for the lubricant. ZDDP additives work by attacking and coating the cam and lifter face with a microscopic layer. Then when the lobe starts to open the valve, that layer is sheared off. This is called sacrificial lubrication and it greatly increases the load carrying capability of an oil."
http://www.ttalk.info/Zddp.htm
"Our representative from a major supplier of performance and street engine parts (EPWI) stopped by to “warn us” of the problem of the NEW oils on flat tappet engines. This was a call that the representative was making only because of this problem to warn their engine builders! “The reduction of the zinc, manganese and phosphates are causing very early destruction of cams and followers”.
You can decide for yourself.