gandalf
Senior Member
There is no way for transmission oil to get into the engine crankcase oil, in a normal engine, transmission hooked together.
Surely, no one would hook the transmission cooler return line into the engine.That would be the only way it could get there.
I agree, there is no crossover point. Nowhere does the transmission fluid go through any part of the engine. It's possible for the transmission fluid to get into the coolant, in the radiator, but if that in turn leaks into the engine it would show as coolant rather than transmission fluid. Other than that, if transmission fluid is leaking, it must be hitting the ground. If the oil level is rising, I'd look for coolant in the oil.
There is only one possibility for a direct transfer. It must be osmosis. ;p