Common 5.0 oil leaks?!?

[Slo5Oh89]

I have a '89 convert with 71K. I am starting to find oil spots. I have replaced the valve cover gaskets over a year ago. Really seemed to slove the problem. I have seen where its been leaking oil under the car like maybe the rear main seal? But the mechanic who changed my clutch said the Rear Main Seal was fine. Any ideas or more info you need. I have to add a quart around time for each oil change. I use 10W-30 full synthetic.

 

[wythors]

Oil pan is very common.

 

[87AODGT]

where the intake manifold meets the block in the rear of the engine, the cork gasket there is known to be a leaker. I used black RTV there every time I ever took a manifold off and never had a problem like the cork gasket gives ya

 

[ID89GT]

Rear main is the only problem I always have with oil leaks. Also my valve covers are leakin but I have cheapo valve covers that I need to swap out..

 

[7upstang91]

All of these are great places to look. ^^^

 

[NIKwoaC]

Oil pan is very common.

Yep. Don't be surprised if you get under there and the bolts are barely finger tight.

 

[skunk21]

everyone hit the good ones but mine pretty much had all these at one time,

Rear of the lower intake

valve covers

oil pan/ low oil level sensor on the side of the pan

rear main

 

[Slo5Oh89]

Ok I think the low oil sensor had oil on it. There a o ring or gasket on that? Also it hard to check torque on oil pan bolts like a lot of them hard to get to?

 

[Mikey1968]

Don't rule out the valve cover gaskets...I've seen el cheapo corkies go out pretty quick..also, they can relax and need a cinching. Best bet is to use the steel core rubber gaskets....seems to work great!

 

[ID89GT]

The low oil sending unit has its own gasket. Only like 5 or 6 dollars from Ford. Its like a big rubber washer looking thing. I have one in my garage that I bought but never used it haha.

 

[hollywoodstang]

front crank seal,
rear main seal,
valve cover gaskets,
intake manifold gaskets,
oil pan gaskets,
oil pressure sensor,
oil level sensor
power steering pump leak
power steering pressure hose
rear tailshaft seal
transmission speedo gear
rear end cover seal/gasket
rear end breather fitting
thermostat housing gasket
timing cover gasket
water pump gasket

These are the leaks that i experienced from my 5.0

 

[kowalczyk86]

where the intake manifold meets the block in the rear of the engine, the cork gasket there is known to be a leaker. I used black RTV there every time I ever took a manifold off and never had a problem like the cork gasket gives ya

I think that is the problem that I am having. There are some stains if you look in my upper intake and I wasn't sure what it was.

 

[Mikey1968]

PCV gasket maybe?