The CRF's are running separate engine and tranny oils, btw. The manual gives a brief break-in procedure. Basically, start it for 90-120 seconds a couple times, letting it cool completely in between heat cycles. Then, ride it easy for 30-60 minutes, varying the RPM's, not hammering on it. Stop, change the oil and filter(s), then let her rip. That's what I've done with my YZF's, anyway, and I've had great reliability. I also change my oil (probably) way more often than I need to. Every 1-1.5 tanks of gas, with filter change every three oil changes. The 450 doesn't generate nearly as many metal shavings as caught by the filter as the 426 did for some reason. Either way, both bikes have been rock solid. (knock wood...)