I wonder if you have coolant in your oil? My cylinder walls did'nt look like that when we opened our engine, but then maybe ours sat long enough? I think that if coolant gets in your oil...you want to get it out of your engine asap, and away from bearing surfaces. Seems to me, someone mentioned that because coolant is heavier, when you pull the oil drain plug...you can see the coolant come out first followed by the oil.