Originally Posted by fastnblu

Don't u mean if Chevy, MB, RR, etc. can recommend 10k intervals , not 100k? Was that a mistake?

I agree 110% on the big bold red part. Oil co.'s are pushin that to sell more. I used to change synthetic at 5k, now I just let the DIC tell me. My bro however, used to want me to change his synthetic at 3k anyways. He's not hard on his vehicles either. I told him he was wasting $, even tho I make more off it. He finally just recently changed to 5k intervals after all these yrs.