I tried asking on some of the FB pages because I hate to pester you all with the simpler questions.
I have an 88 with the 2.5/ isuzu 5 speed.
Replaced the rear main.
New oil pan and gasket.
New timing cover and gasket.
New valve cover gasket (3rd one finally worked)
Replaced the dipstick o-rings.
New oil pressure sending unit.

These are all things that needed to be replaced anyway as they where old and dry rotted.
I'm still getting a major oil leak from the starter area. I dropped it down and could not find where it was coming from.
Please help....

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1988 Fiero 2.5

What about the camshaft seal/cover above the rear main?

doesn't the 2.5 have a "side cover seal" where the lifters are ?

Yes it does

The cam cover was clean when the trans was apart from the engine.
The lifter cover is on the other side of the engine, but is also dry.

Have you checked the oil pressure sending unit?

Yes, I replaced it with a new one. The old one was cracked and leaking a little.

quote Originally posted by Zeak: Yes, I replaced it with a new one. The old one was cracked and leaking a little.

Did you coat the threads with a sealant?

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Also check to see that the oil filter is not leaking, I know its on the other side but oil can drip under and over.

Yes to the sending unit threads.
On the 88 2.5, they built the oil filter right into the oil pan.
That's where the oil pump and balancer assembly is.
The only oil in that area seems to be blown there by the passing wind.
Has any one tried leak dye in there oil? I'm out of ideas now....

I've used the dye on a lot of machines, works great for chasing down those pesky little leaks that you can't find the source of.

Can you back it up on ramps and let it idle while you look to see where the oil is being forced out?