Hi, please can you recommend oil for the ZX9R C2. I'm thinking about Silkolene Comp 4 10W40 or MOTUL 5100 10W40. Kawasaki in service manual recommend 10W40 or 10W50 oil. Is semi synthetic good enough for normal road use. Also found on the google that Silkolene maybe improves gearbox performances. Thanks! Cheers, Alen