oil in radiator

[gmmuscle]

Checked my radiator today after a fresh oil change and the cap was full of what looks like oily paste. It does not smell of oil. What should i check? I'll do a coolant flush tomorrow. Any tips on the best way to perform a thorough cleaning? I see no evidence of coolant in the oil.

It's on an 86 GN with 85K miles.

Carl

 

[unobetr]

you need to do a leakdown test.

 

[HighMileage]

Possibly a leak in the tranny cooler in the radiator?

Is the paste pinkish/reddish? Have you checked the tranny fluid lately?

Steve. '87 GN.

 

[chopped39]

Factory radiator? Oil cooler in rad? What kind of coolant? No coolant in oil?

 

[83ttypecooled]

paste on the cap

Hi,
Was the paste somewhat yellowish? I think this is the beginning of seepy headgaskets. There are other possibilities,but I think you are dealing with the beginning of a head gasket issue.

 

[SHADOWII]

What about....

The trans cooler lines? do you have the transmission oil lines still going to the radiator? If so, check the tranny fluid.

 

[bad V6]

Possibly the engine oil cooler is beginning to show it's age. I had to replace mine a couple of years back, for the same reason, oil appearing in the radiator.