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Probably engine oil, unless you have been adding water pump lube. The oil can come from a blown head gasket, or if you are lucky it can be the transmission oil cooler inside the radiator has failed and is leaking. Either way, DO NOT RUN vehicle until you fix the issue and change all fluids. There is a tester that is used to pressurize the radiator which may help determine what has failed. Many parts stores have a loan-a-tool program that may have this tester.
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.
either you havent flushed the cooling system out properly ,or the oil cooler has packed up ,their is a oil cooler radiator of sorts that the oil filter screws onto ,these often leak ,just remove the water pipes and join them together with a small piece of copper pipe ,then if you see oil coming out of the water pipes fit a new cooler
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.
Does the oil in the radiator look reddish? likely it does...You most likely have a failure inside the radiator where the trans cooler coil runs through it. Replace radiator and have trans fluid changed and flushed. If slipping continues trans will need a rebuild. (hope not)