Well I changed my own oil on my G650GS. Dealer rates are atrocious ($200 or thereabouts), and I got it done for about $30. I might let the dealer check the valves at 12k, but the plugs and filters look easy enough. 3600 miles on the bike, went with Rotella 15w-40 and a BMW filter kit. Shifts real nice, and I can't see the Rotella being anything other than more durable than the BMW 10w-40, by Sikolene. Took about a 350 mile ride the other day, she did real well. We'll see how she holds up, but looking good so far.