RCW- I have a pilot's license. One of the first things I was taught was to keep the tanks full so I'd avoid condensation. Tractors should have little drains like plane tanks, so you can pull a sample off the bottom and look for water. lol At least when the tractor tank has water in it and it does, you're still on the ground!
As far as chain saws go, I was not a kid. I bought a Poulan 35 years ago that has served me well and never had that problem- the oil cap is smaller than the gas cap. My "friend" bought a Stihl, then decided she wanted to cut wood too instead of just carrying it, so we got another, bigger one. On both, the gas cap and oil cap are exactly the same size and color, so if I filled them upside down (I guess), I'd eff up. Gas in the oil isn't so bad. Oil in the gas sucks, especially if it gets into the carb. I've since learned that the muffler is close to the oil and the oil cap usually has a bunch of sawdust stuck to it, whereas the gas cap doesn't. Not to mention, the gas cap is at the handle end of the saw and the oil is by the bar. lol You'd think it would be obvious, wouldn't you?!
As far as chain saws go, I was not a kid. I bought a Poulan 35 years ago that has served me well and never had that problem- the oil cap is smaller than the gas cap. My "friend" bought a Stihl, then decided she wanted to cut wood too instead of just carrying it, so we got another, bigger one. On both, the gas cap and oil cap are exactly the same size and color, so if I filled them upside down (I guess), I'd eff up. Gas in the oil isn't so bad. Oil in the gas sucks, especially if it gets into the carb. I've since learned that the muffler is close to the oil and the oil cap usually has a bunch of sawdust stuck to it, whereas the gas cap doesn't. Not to mention, the gas cap is at the handle end of the saw and the oil is by the bar. lol You'd think it would be obvious, wouldn't you?!