Y'all,
A post in another car forum warned of a shortcoming API rated oils may have regarding cam wear. The question relates to lubricating oils with reduced zinc dithiophosphate (ZDDP) in engines.
Thanks!
Mike
Y'all,
A post in another car forum warned of a shortcoming API rated oils may have regarding cam wear. The question relates to lubricating oils with reduced zinc dithiophosphate (ZDDP) in engines.
Thanks!
Mike
If I had one, I would only run a quality full synthetic in it, it's not worth taking chances.
The link purports to warn us the current API oils (mineral or synthetic) lack enough ZDDP to protect flat tappets. I haven't heard of problems but figured PRV owners would be up on the status of the oil they use.
There is much talk about this in old car circles these days. Perhaps the most reasonable advice I have seen is to use the dual rated diesel/gasoline fleet oils such as Shell Rotella (or Rotella T Synthetic), Chevron Delo and the like. These are readily available in
15W-40, which is a good summertime oil in many older applications and can also be found in 10W-30.
Thanks, John. That does sound reasonable.
Mike
ZDDP isn't the only antiwear agent that is effective...it is just the cheapest. It is also an effective antioxidant. There are substitutes, including Molybdenum Trialkyldithiocarbamate, but they cost more.
A dual diesel/gasoline rated engine oil, either 15W-40, 10W-30, or synthetic 5W-40 is a cheap, easy, effective alternative for these older engines. Modern engines have no problem with modern oil. For a modern gasoline engine, the dual-rated CJ-4/SM diesel engine oils will work very well due to the lower level of ash producing metallic detergents in the oil.
Ken
Michael Pardee wrote:
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