I just drained the rear end and transmission on the truck which has 13,500 miles on it. So, as you can imagine, it drained out looking nice and clean. Can I dump it in the oil tank? I figure it's nice and clean and will be diluted with the #2 heating oil anyway. I know it sounds like a horribly cheap behavior, but I figure it saves me the inconvenience of going to a recycling place and may as well burn it. By the way, I wouldn't do this with crankcase oil. So is this a nutty idea?