Figured I'd pick the your brains for the wealth of knowledge they possess! Like the subject says my Massey Harris 81 started smoking recently. It's a slightly blueish white smoke coming out the exhaust. The tractor starts a little rougher than usual but otherwise runs fine. All I can think of is it's started burning antifreeze. I am going to take to my repair guy as soon as I can, but would like your help first, thanks.