Grayracer, I ran 4 quarts of some 10-40 Torco T4S4 100% syn. oil through my bike, a buddy had a line on some through his distributor. I've switched over to Amsoil MCF 10-40 and was wondering what frequency you change yours at ? I've searched through your posts and found this "I change oil and clean the filter every second or third ride day." I've got an hour meter and these have been my intervals : Engine oil/filter change @ 2.5 hours - Torco T4SR 100% synthetic April 24/10 Engine oil/filter changed @ 7.5 hours-Torco T4SR 100% syn 5 hrs May11/10 Engine oil/filter changed @14.1 hours-Torco T4SR 100% syn 6.6 hrs June 21/10 Engine oil/filter changed @ 20.3 hours-Torco T4SR syn 6.2 hrs July 9/10 Engine oil/filter changed @ 27.9 hours Torco T4SR 7.6 hrs August 6/10 Changed oil Torco T4R syn. Blend @ 35.1 hours 7.2 hours So, I've changed the oil out between 5 hours to 7.6 hours, not including the break-in period. I've got a case of MCF and am wondering if I should keep the same intervals between changes the same, or increase them ? Do you change your filter at every oil change ? I've done that up until this last change. Thanks for your input !