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unlikely to be engine oil, more likely transmission oil from faulty transmission oil cooler in radiator tank
take it in for a proper diagnosis and quote
the coolant system will have to be properly and completely flushed
Can you pipe the hot oil out to the after-market cooler, let it work, and pipe the cooled oil back in? You're not giving the internal cooler any "work" to do, but who cares, since the goal is to cool the oil.
If transmission oil cooler is leaking, engine coolant may enter cooler, or transmission oil may enter engine cooling system. Both engine cooling system and transmission oil circuit should be drained, flushed, and inspected.
oil in the cooling system comes from a transmission oil cooler in the radiator leaking. I take it that you have an automatic transmission Normally if you have a gasket problem the water would be in the sump oil. You will need to replace the radiator to effectively fix the problem and as a side suggestion consider an air cooled transmission oil cooler for the transmission oil as it helps the car to run cooler and keeps the transmission oil cooler and extends the life of the transmission.
Not uncoomon. If you look where the oil filter is in the front of the motor by the radiator. Where the oil filter screws onto is the oil cooler and has coolant passing around it in a jacket. The oil pressure is greater than that of the cooling system pressure. Replace that cooler and flush the cooling system. This should cure it.
There is a very easy way to check the oil cooler for leaks.
Do this with the engine cool and be prepared to catch some coolant in a pan.
Remove the 2 coolant hoses from the oil cooler and attach them together using a 5/8 inch straight heater hose connector. You are bypassing the oil cooler temporarily. Wipe the oil cooler clean so you can clearly see any leaks develop.
Now run the engine and watch the oil cooler pipes (the ones you just removed the hoses from) carefully. If you begin to see oil seeping from the cooler pipes you've found your problem.
This might take a while to see so be patient and let the car run for at least 15 mins or more.
Don't worry about the cooler being disconnected while the car is running, but I do recommend reconnecting the cooler if you have to drive it even if you find it to be leaking.
If it is found to be leaking, you will need to replace the part and have your coolant flushed out properly to remove as much of the oil as possible from the system. Also change the engine oil at the same time, it is possible that coolant has gotten into the oil although it may not be obvious.
This is probably a head gasket problem and not an oil cooler problem.
The oil cooler is fairly easy to test.
Remove the cooler from the engine but do not disconnect cooling lines and then pressurize the cooling system. You can use a radiator test tool to put pressure on the cooling system and look for leaks. If it leaks, replace it.
You may also be able to bypass the oil cooler altogether if it leaks.
The head gasket is another story.
Get a 1/4" pipe to spark plug fitting and put a male air coupling fitting in it.
Then you can charge the cylinders with air from your compressor.
Make sure each cylinder that you test is at top dead center so that the valves are closed.
If air bubbles into your coolant, you found your problem.
If air leaks out your intake you have a bad intake valve
If air leaks out your exhaust you have a bad exhaust valve etc.
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