Re: Craftsman w/Kohler engine-Smokes
first understand that oil is supposed to lube everywhere...including valve guides and piston skirts...all the way up to the top ring...bottom ring distributes oil over the cylinder. middle ring wipes it back down, and only the top ring is the compression ring...and oil is good.
horizontal shaft engines benefit from gravity to let that oil run back down into the sump...vertical engines puddle in the cylinder...and that's what you see on start-up. oil can only get into the combustion chamber thru the valve guides or past the rings. if an engine is run on old oil, and allowed to sit for long periods, crud can act like glue to stick the rings to the piston instead of springing against the cylinder wall...or dirt can score the walls to allow an excess in the conbustion chamber.
a bit of smoke on a cold engine means nothing...only if it still smokes at operating temps do you have a problem.
usually, the exhaust valve guide will wear first, and the rings should last a long long while...and are replaceable...as are scored pistons ect...the critical part is the aluminum cylinder wall (unless it's sleeved)...and even that can be fixed.
you might try changing from a 10w-30 to a straight 30w oil. hydraulic lifters like 10w-30 on cold starts because they pump up faster, but a straight 30w won't hurt them a bit, and the thicker oil should lessen the puddling/smoke. winter specs may even specify a 5-30w...what do you have in there now?
I suspect you have a normal condition, with perhaps some mechanical wear, amplified by thin oil.
you might also check the plug color, and if it's black-ish more than cocoa, switch to the next higher heat range.