Wish I had researched a little more before i bought my D140 last year. Bought it April of 2013, now has 29 hours and seems to have a whine in the transaxle. Is this normal for a K40? Should I go ahead and change the oil in the transaxle?(yes I know it's a rather lengthy task) Overall it has been good so far. My only real complaint is it leaves strips as it cut due being a 3 blade deck and now the whine. I will have to wait for my warranty to expire before I think about upgrading to a k66 trans but it does sound good.