If I remember correctly, the Burgman 650 owners manual calls for 90W gear oil for the final drive. Or at least it had something marked '90'. At the Suzuki dealer they picked out for me a bottle of gear oil marked 80W -90, non-synthetic. Is this the right stuff? It seems pretty common because I've seen it at both auto parts stores and Wal-Mart type stores. I'm at the 600 mile point and am still waffling on whether to do it myself or have the dealer do it since it involves inspecting some other things, but I would like to know if I've got the right oil for later changes at least.