I do it also, but does 50 hours or so seem like a very short interval for changing oil? I know the engines co. recommend this, and so I believe them/do it. The reason you do oil changes is to get rid of the oil "used up" oil right? If so, wouldnt it seem like this oil is capable of more than 50 hours of use? Does anyone know the operating temp. of say a 27 pony kohler air cooled? My only idea is than these engine run far hotter than car engines, and the oil breaks down faster. On the right track? PS- I agree that 5 bucks in oil every once in a while beats the heck out of 2k for a new engine!