oil leaking out of exhaust pipe, mixure of oil and water spitting out of exhaust pipe when revving engi Options

[kajon95]

i have a 1995 Celica 1.8ST. It's been losing lots of oil lately but can't seem to find any oil leaks. No black or blue smoke from the exhaust either. So not sure where the oil was going. Yesterday, I found out that when i rev the engine, the exhaust pipe spits out a mixture of oil and water. It's left stains on my drive so i know that it's oily. Not sure where to start from now. Please help

[alltracman78]

Drive at a lower RPM.

When your engine is running oil is thrown from the sides of the rod bearings onto the cylinder walls. This is how they are lubricated. The oil control rings clean this oil off the walls and drip it into the oil pan through holes in the side of the piston, so it doesn't get past the compression rings and burned in the combustion chamber.

Higher RPMs means more oil is thrown onto the walls. Once a certain amount is reached, the oil control rings can't remove all the oil from the walls [only so much can be dripped through the relief holes in the side of the piston]. Whatever it can't remove gets burned [the compression rings aren't designed to remove oil].

If you burn ONE DROP of oil in each cylinder every time it combusts, you will burn all your oil long before 3,000 miles.


This is a common problem on 7AFEs. I would guess either the rod bearings have too much clearance, or the rings aren't sufficient. Or both.


In addition, if the engine isn't heated enough to burn off water [humidity and condensation], your oil level can be effected by the amount of water in it. Half a quart would turn the oil milky though, so you didn't have that much.

If you want to find out how much oil is actually burned [probably all of it], run it hard, top it off, and run it hard again, then check the level.