Posted by James22 on July 20, 2008 at 13:19:02 from (207.179.239.6):
In Reply to: Engine oil posted by ShaggyM on July 20, 2008 at 11:08:32:
Yes, agree with Lance. Zinc diphosphate is a extreme pressure anti-wear additive that will screwup catalytic converters. Diesel oils still have it, so use them in older tractors and cars which don't have a roller follower, type camshaft. If you need cold weather startability, just use a synthetic diesel oil such as Deere's 0W40. GM also sells zinc diphsophate for new camshaft installations. Recently it was unavailable because the old supplier dropped the product and GM had to find a new source. I've heard it is available again. You could buy this additive and add it to "regular" oil.
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