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 - The Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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