Hey MrNickleye!

mrnickleye · 08-18-2006, 06:14 AM

I don't use syn oil on an engine with lots of miles. It is great for new, or very low mile engines. It lubes better, lasts longer, and runs cooler.

But an engine with miles on it has built up petroleum based residues and varnishes on all the surfaces. These built up deposits help take up loose clearances. Remove them, and your engine will break down quicker. Can you say "rod knock"?

That is why its not a good idea to use one of those engine cleaners in one with lots of miles on it.

If you want to clean out "some" of the sludge inside you crankcase, just add 1 qt of Dextron III ATF to your oil about 10 miles before you are gonna change the oil. (1 qt overfill won't hurt for this short time).

The ATF has more detergents than motor oil, but won't remove the varnish.

08-18-2006, 06:14 AM	#4
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	No syn oil in old engines I don't use syn oil on an engine with lots of miles. It is great for new, or very low mile engines. It lubes better, lasts longer, and runs cooler. But an engine with miles on it has built up petroleum based residues and varnishes on all the surfaces. These built up deposits help take up loose clearances. Remove them, and your engine will break down quicker. Can you say "rod knock"? That is why its not a good idea to use one of those engine cleaners in one with lots of miles on it. If you want to clean out "some" of the sludge inside you crankcase, just add 1 qt of Dextron III ATF to your oil about 10 miles before you are gonna change the oil. (1 qt overfill won't hurt for this short time). The ATF has more detergents than motor oil, but won't remove the varnish. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.