Rider_Rico
New member
I know the manual calls for 15w50 for my 650gt. However, I've always used Amsoil full synthetic on my previous motorcycles. I changed the oil and used what Amsoil told me was comparable to the 15w50. They don't have that weight so I used 20w50. Immediately after I noticed that the bike would shake more when idling. I'm thinking it's due to the oil. What are your thoughts?