DA reccomends what DA sells. I have 2- DA's that have had nothing but KLOTZ run through them. I can refer you to numerous others running the same. This is the only oil I have used for years, no reason to change. I can also say the absolute strongest DA-100 I've seen was broke in on KL-310 and has had a bunch run through it. Asking DA about KLOTZ is like asking them if my 3W will run as good as a DA. Maybe Mobile will tell me Shell is good gas. Don't ask them ask Joe consumer that runs both, I do on KLOTZ KL-310, 50-1.......