Join Date: Jun 2010
Location: Pac NW
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Well, if your engine does not leak out, it leaks in then. Catastrophically, I must say. Unless you missed zero in 300 number.
Go to tailpipe and stick finger inside. Is it all sooty?
You likely have blow by burn out. Stuck piston rings, hardened valve stem seals. The usual. Cure is either to pull heads off and replace seals and pull pistons same time, clean or replace rings. It's major overhaul whichever way you look at it.
That you have passages plugged in the head that's for sure, judging how much oil collects under valve covers.
Personally, I'd have done aggressive engine Seafoaming. 2 cans of Seafoam into crankcase, drive for about 500 miles, drain oil, do filter, refill, 2 more cans, do same, 2 more cans, do normal oil change. It's a bit of work to do but it will open at least most of the passages and remove at least some of the crud on piston rings. If you feel brave, you can pour Seafoam into cylinders and let it sit there overnight. Then start engine. Done it. It works fine, engine tends to cough a bit starting but worse part is - it will produce huge white cloud coming out of tailpipe for about 5 minutes. As in - solid military grade smoke wall. So hood may not appreciate this.