Picked up a SA that had been sitting for a while the other day for $500. Got it running, but it smokes blue smoke. Soaked cylinders in sea foam, ran, soaked cylinders in marvel mystery oil, ran hard in high gear for 30 min, still smoking. Thought oil level may be high, so drained oil. Oil was nasty and had about a handful of coolant in it, not really overfilled. So, what do y?all think, cylinder liner o rings or head gasket? Pretty rough tractor, noisy trans, left final housing repair from mounting nuts coming loose in the past, touch control box needs rebuild, leaking oil and arms fall after engine stop. Needs other normal items, but been painted once and not rusty. May end up being a parts tractor...Opinions?