Several of you suggest using Mobil 1 15-50w synthetic oil, where can I get it cheap and how much can I expect to pay? Also, call me crazy, but I have a 99 400 and have gone thru several rear tires on it including various Dunlops, IRC's, & Michelin's but by far the best handling and longest lasting has been the $31.00 C-755 Cheng Shin!! If your tired of getting 5-6 rides out of your tires try these. I have consistantly gotten twice the wear out of them with no chunking and good traction on all surfaces. I ride MX exclusively.