Okay fellow BRP owners, Question about oil - what is everyone using???? GN4, Maxima, Amsoil, Mobil 1 redcap, synthetic versus non,etc. There is a nice long thread in the XR400 forum about Maxima4 and Amsoil but I think they are partially promoted by those that sell the stuff. Rockatt says red cap, Qadsan says Maxima, I'm so confused. Also, what is the change interval - the book says 600 miles, should it be less? A greased pig is a happy pig. Bring it oinker riders!