Wow this thread is over a year old...but I change my 115hp and 9.8 outboard mercury engines cold at the end of every season. I just can't see where it I worth the hassle putting the muffs on the engines and letting them run in my driveway. I always fish too far from home and I don't want to change them at the lake parking lots. All my other vehicles I change the oil hot and believe that is the best way and I have been doing that for many years.