I changed my oil today in the bike. As I was updating my maint log I realized I went 10k miles on the oil. It did not appear to be anymore dirty than my regular interval. Meaning it wasnt pitch black like your auto oil can get. I will see what the oil report says, ought to be pretty interesting. We are gonna see how good this Amsoil really is I guess. After the oil stopped draining I put in 1/2 qaurt to flush the oil out real good, did this twice. The first time it was still pretty dark coming out. The second time it was clean oil coming out. I have always done this on my bikes and cars, its amazing how much dirty oil you can get out just by wasting another qt of oil.