I have a 1995 Isuzu Redo 3.2 single overhead cam engine, V6 4x4 vehicle. I had what I call a vomit of oil/coolant mixture that happened on the lower part of my engine. I am replacing the heat exchanger that comes off the oil filter. Now, I hope this is where the problem lies. My question to you is, from the water pump, can coolant get into the engine oil from there or not?