Yep the oil is a pain but Saitos seem to be the worst of the bunch when it comes to sliming an airplane. Not saying they are bad engines; they're great. They run well and are dependable. I've just found them to be gas guzzlers and spit a lot of oil. Some other engines seem to be much better in this regard. I get much, much less oil from my OS .91 4-strokes. The new alpha series is even better with their upgraded lubrication system. Even my YS engines don't make quite as much mess as the Saitos I've owned.