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 - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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