oil

I've just bought a new SuperJet. The previous owner had been running Yamalube 2R in the ski. He said something about it not being designed to be environmentally friendly, thus not having all the stuff that would damage the ski over time. However the manual for the SuperJet says to run Yamalube...

I work for a motorcycle shop so i get oil at a discount wondering if theirs any risk in running my SXR with something like Motul 800 or Silkolene comp/super 2 and what fuel to oil ratio does everyone run i know the SXR is recommended 60:1 but it seems odd because i run my 2 stroke bikes at 40:1...