I own a 1999 BMW R110RT with a boxer two cylinder air/ oil indestructible and have been known to exceed 400 thousand miles without any significant work, just regular maintenance. However they are prone to carbon build up in the combustion chamber. I'm familiar with your products having used them in automotive and motorcycle applications in the past. So I figured it was about time to run a few onces of the fuel treatment through the system. Well i took it one step further and sucked about two or three onces through the vacuum ports on the throttle bodys. Wow!!! what a difference after the treatment, carbon and I can only imagine what else I had a new machine! Smother at idle, crisper acceleration all and all more power through- out. Thenk you Lucas oil, you have a customer for life!