Switching noise at the XSR900

Hello to The Motorradgemeinde! Last week I was in South Tyrol and had to find out that the XSR is extremely loud when putting in gear. It makes a sneezer that it is to fear. What optimal oil for the clutch would you recommend. I have now filled one of the specification of Yamaha corresponding oil the manufacturer is a not known to me however. Seller it should be a shell oil. However, I am happy with these noise scenes spec. if I in the 1 . Gear does not switch. has someone experience with another oil the price is in this case incidental to me is important that the clutch does not break due to lower oil quality.