Years ago our '94 850 overheated a couple of times. It was the big relay at the top of the radiator shroud, which controls the electric fan. When sitting still, it wouldn't come on. Replaced it quickly and no problems since.
My local garbage collection company will take up to 2 gal a week of waste oil in the translucent white milk jugs with the lids on. Pretty convenient, although I’m a bit suspicious of where it actually goes.