I wish it was mine, but........... A buddy just bought one of these with 50K miles. Nice sled. It has been dealer serviced and the dipstick was low, so he figured he would have the oil changed out. I told him a little about this board and that 10w60 is recommended fill in the new ones, but it turns out not his. Anyway, dealer did an "oil service" not an oil change for, get this $260 WHOPPIN BUCKS. I also gets a microfilter, oil filter and DINO-thats right DINO oil. they put 5w30 in. I advised an auto-rx clean and go syn. My first thoughts were M1 0w40 or delvac 5w40 in summer and M1 5w30 or castrol german 0w30 in winter as it will not be driven too much in Chicago winter. I also gave him a blacksrone oil analysis kit. Will post once back. The dealer would not reset the service light as it had not hit 9500 miles yet, though they also recommended a change as the DINO had been in 8200 miles-OUCH. We'll see what the results are. Any what do you all think about what to use in this bad boy? Thanks