I have a 95 Z28 with 28,000 miles. Engine runs strong. No knocks/noises. I am seeing oil in the radiator and reservoir. I'm gonna take it to the shop, but could anyone tell me what it PROBABLY is?

 

Could be a blown head gasket or a blown intake gasket. As far as I know, those are the only possibilities.

 

How long have you owned the car, and is this a new development? You're sure nobody ever put some of that brown sludgy stop leak crap in your cooling system?

 

could be head gasket, cracked/warped head, or even cracked block....most likely head gasket.

 

Are you certain that it is engine oil you are seeing? If someone put a stop leak goop in your cooling system, that will look like nastly, smelly, oily gunk after a while.

It is a complete pain to get flushed out also (ask me how I know).

 

Oh Oh Oh Pick Me Pick me!!! HOW DO YOU KNOW??????

 

Heh heh heh...there's an echo in here.

 

If you have an automatic transmission, there is also a possibility that the transmission cooling coil inside the radiator is leaking and allowing transmission fluid into the coolant.

 

did you get a chance to get this figured out? I am coming into the same kind of problem, I am getting it checked out friday.