I will definitely be replacing everything behind the timing cover, only want to do this once. I drained a majority of the contaminated fluid, let it drain for about an hour. Filled.with fresh oil. Did not add coolant, -2 celcius so was not worried about it overheating running for a few min. Wanted to start the car to see if it was hammering or knocking. That would be the deciding factor as to whether or not I fix or sell. Sounded good so as soon as I finish the front hubs on the Mazda, into the garage it goes.