Mike,
Any anti-freeze found in your oil is an ominous sign of impending trouble. The other posts to your message are good advice, but if your 1947 A hasn't been overhauled in decades, it could be a sign of anything from a bad head gasket, leaking sleeve seals, a porous hole in a casting, a cracked head or block. If the tractor runs good and you don't have accumulation of anti-freeze in the oil if the tractor is sitting (not running), replacing a head gasket is a cheap fix, and fairly easy to do yourself. Plus, with the head off, you can inspect it for cracks. Another suggestion: if the anti-freeze is more than 5 years old, replace it with fresh. Glycol based automotive antifreeze has a tendency to break down after 5 years of use. I don't know where you live, but with colder weather approaching, it would be wise to have the antifreeze protection level up to the climate your tractor is in-especially for freezing temperatures if the tractor is going to sit idle through the winter.Another thing: Antifreeze is very hard on bearing surfaces. I know you said that you don't have much experience with your tractor's engine but if the leak get's worse, and chances are it will, a relatively minor fix now could stave off a complete and costly overhaul later. If you're not inclined to tear into the engine, adding some leak sealant to the cooling system might get you by. If you put some sealant in your cooling system, run the tractor for a while and let the coolant warm up to help the sealant do it's magic. Good luck!
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