When you change the oil, are you filling it to the dip stick level or by the recommended refill? Could have the wrong dip stick if it takes more than called for.
That much oil is going to be obvious where it's going. I've had old junkers that poured out the rear main every time it was parked, and they did not use excess oil. A leak of that size would be dripping off the rear bumper!
Might do a plug check, see if they are showing signs of oil deposits, sticky black on the end of the threaded part, black spots on the insulator, or crusty carbon deposits.
Do check the PCV valve, go ahead and replace it. Check the vacuum to the valve, could be the line is clogged or collapsed. Check the breather to the air filter, it needs to be free flowing too.
Have a look under the valve covers, the drain back holes could be sludged to the point they are filling with oil and sucking down the PVC. That is a severe case of neglect and worn rings to make that kind of sludge. Could be a result of the past overheating. If it is sludged that bad, cleaning it out might help, but eventually it will need a rebuild.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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