The most likely reason would be that the oil cooler behind the exhaust manifold has failed internally. To replace it you remove the engine cover and the front air intake bellows. Drain the coolant out. Remove the alternator and the exhaust manifold. Remove the cooler lines and the cooler from the engine. Reverse the process with the new cooler.
Get new coolant hoses for everything, oil will cause them to deteriorate and fail. I would also say it's a good time to do any other work.
Before you replace all the hoses, but after you replaced the cooler you will need to do a full cooling system flush to remove the residual oil. For this I use Dawn dish detergent and mix it with plain water. Remove the thermostat and run it through the engine and heater core until the engine warms up. Let it cool a bit and drain out the mess. Now rinse the system until the water is clean coming out. Now change the hoses and water pump. That way you do not run oil through the new hoses.
Change the oil with some cheap oil and replace one liter/quart with ATF. Run the engine for only a few minutes. Now change the oil filter and run it a for a few more minutes. This should clean out any contaminants from the oiling system. Once you have run it for ten to fifteen minutes you can drain out the oil/ATF and change the filter and add the correct oil.
If the engine has not been running with coolant in the oil very long you should be okay. However, if it has been a while the damage may have already happened to the bearings (modern coolants destroy them in short order). If that is the case you may consider a replacement engine or vehicle.
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Thursday, February 15th, 2018 AT 1:59 AM
