Yes, the oil will thin out as it warms, BUT, a crack may open up a little also. Also, if there is a crack in the lifter area, you won't lose any oil, it will just drop back into the pan. And, there's no water jacket there so you won't have a "water in oil" problem. PLEASE, keep in mind, I'm not saying this is definatly your problem. It's just a viable option. With all you've done so far, I can't think of anything else. You're surely welcome to get another opinion. I have to admit, I've only seen this once before and that was in a Buick 231 V6 that was overheated so bad, it melted the valve seals.
Thursday, April 9th, 2009 AT 4:20 PM