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I wouldn't think the Duc has special oil requirements that other engines dont. I'm using Amsoil. The Motul was more expensive, and my prejudice says it's not as good.
Not saying requirements, just wondering what folks are running with what results. Different engines react to different fluids... uh... differently
Mine's currently running Mobil One 10W40, but I'll hit 1500 soon and do another change. Might want to switch up oils if someone has some anecdotal evidence leaning towards a particular lube.
And the day I see a Nippon engine running in my greasy pizza bike... I'll move on to German snobbery ;)
Mobil 1 15/50 synthetic. Cheapest, fine quality. None of the other high priced oils are any better. I've been using M1 15/50 synth in my 916 and ST4 for years and both desmos are happy as pigs in shit.
Visit any Duc board and you'll find M1 is highly popular and recommended.