Posted a few times now re: a new to me 07 450f. When I got it the oil level was low and it was thick/jet black. Changed oil/filter, rode for an hour before the timing jumped. When replacing the cam chain, the 1hr oil was almost as black as original, so I bought 3 Qts of cheap 10-30 and ran each for 10 mins or so before changing. Still dirty so 3 more changes (including 2 Qts of diesel spec oil) and it's not black, but a really dirty gray. Went to the desert this weekend on good oil/new filter and did 20ish miles, changed it, did 20ish more, changed again. The last oil change looks as dirty/gray as the 3rd 10 minute change. Did over 100 mi yesterday but haven't dumped that oil yet. Bike doesn't smoke. Coolant is fine. Clutch has good feel/operates fine. I'm stumped unless there is a plug of gunk hidden away somewhere. I've had the left case cover off and it was clean, but I haven't pulled the clutch cover or right case cover yet. Any ideas???