Water in the bottom of the air cleaner is a good indicator that you'll likely find some water in your crankcase, too, but also suggests that it comes from condensation, so we're gettin' there. Any sigificant amount of antifreeze you might find in the crnkcase is another story, but we'll deal with that if you find it.
As far as oil, any automotive grade motor oil will do. With the cleaning and flushing you will have done to clean up the sludge on top of the head, you'll want to change it out along with the filter after five to ten hours or so of running.
It will be important to warm the engine up well each time you run it at this stage, for a couple of reasons. First is that you can count on there being more of that grey sludge further down in the engine where you can't see it or get to it to clean it up. A lot of that grey is moisture, and warming the engine up well will help to evaporate it out. The other is, if your tractor has a pressurized cooling system (some don't), warming it up enough to pressurize the cooling system will force antifreeze back into your oil system if there is any leak (gasket, head or block) that requires attention, and that will show up when you change the oil. Of course, we're hoping that that will not be the case, but getting things warmed up well will be the best, surest way of checking things out.
The fan and radiator are VERY efficient on these tractors and their engines don't warm up quickly or easily unless you're really working them. If you don't have the opportunity to really work her hard, I've been known ;8^) to start one up and put a tall kitchen trash bag over the grille -- the suction of the fan will hold it in place and, while it isn't as effective as radiator shutters, it will block off enough air flow to allow the engine to warm up. It might take a half-hour or more like that, but run it each time until the block, not just the head, is too hot to rest your hand on comfortably behind the oil filter or behind the carb on the other side. This would apply as well to the first run with the washing soda in the cooling system, though I would keep the radiator cap OFF for that run.
This thread is starting to sink down a few pages, so please start a new thread so it will be at the top to let us know what you find and how you're making out.
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