I would NOT run straight Marvel mystery oil in the crankcase, but it would be O.K. to substitute one quart of engine oil for one quart of MMO or ATF. Doing so would probably not help very much though. The smoking at idle is most likely because of worn valve guides which need to be replaced. There are no valve seals unless someone has added them in an attempt to cure the worn guides. The fact that the compression raised by 10 pounds when you added oil to the cylinders tells me there is a piston ring problem also. Your engine is telling you that it is getting tired.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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