New to the WH world and this forum. Got a 1980-83? C105 with a K241AS 10 HP from a relative and it smokes a lot on start, then calms down and runs pretty good and clean after 10 minutes or so. I read elsewhere on this forum that Shell sae 30 Rotella T1 would be a good try.(Might not burn as bad). I did, since it needed an oil change anyway (badly) and now it smokes worse... I also was told it may be a clogged breather? Or worse case top end new rings, piston etc... When I changed the oil it was black and what I would call "sooty" looking... No idea when oil was last changed but tractor sat for three years... Any thoughts would be much appreciated! sylvanlakewh