Atomic

Hi all, I have had many headaches over this problem, and trying to find a solution of course has only made them worse.

I have an '88 5.0 with 99,000 miles on it. It was supercharged about ten years (5k miles ago) and this past summer I finally got around to getting bigger injectors to fix the air/fuel ratio.

This is my question. Will the higher pressures of the fuel and air inside the engine lead to higher oil pressure in the crank case? I'm taking a shot in the dark on this one, because I have a very serious oil leak. Actually, I'm losing about a quart of oil every 60 miles and need to keep some in the trunk whenever I take it out.

My sneaking suspicions are that it's a high oil pressure causing the rear main seal to spurt oil (I never looked too close to it at idle, but my garage floor is a mess of stains because of this).

Looking for anybody who has/has had this problem before, or if anybody can tell me what's going on.

tinman

Any coolant in the oil?
I'd run a compression test just to make sure of what it is, all the cylinders should be within 10% of each other..........

dawson1112

Do you have any idea what your current oil pressure is? Its possible that you just need a new rear main seal. If you don't have an oil pressure gauge capable of giving you a accurate reading I suggest getting one . Normal pressure should be somewhere in the 40-60 psi range. Have you ever replaced the pcv , if not it could be plugged , or the screen under it is plugged . If you have no crankcase ventilation this would cause oil leaks in the seals.

mjr46

check pcv if it is fine, replace the rear main seal and any other leaking gasket, 20+ year old car and gaskets and rubber become brittle =fact

uedlose

=fact =fact I think MJR46 might be on to something here

Atomic

In response to an earlier post, no coolant in the oil and I don't have reason to believe I'm burning oil either. Thanks for the help guys, as soon as I pull the cover off it I'm going to check all the seals. Kind of had a "duh" moment here. I had a friend of mine tell me about a part called a breather, do you all think that might help? Seems like if that does the trick then it's a heck of a lot easier than trying to access the rear seal.

Atomic

Also, it's leaking directly onto the exhaust manifold if that gives any more clues.

Duncan_GT

Do your valve covers accept a breather? Otherwise you'll have to modify and punch a hole in one, if not both, of yours.

dawson1112

If its leaking onto the exhaust manifold I doubt its the rear main seal , more than likely the valve cover gasket is bad. I guess you need to trace the leak back to its source.