Now stanley this is a fine mess we are in
I have tried most of the different types of oils in my 03 speedie (27,000 ks)including sythetics and semi synthetics but for me and my bike diesel 20-50 is the best. I think in america lots of bikes use shell Rotella which started out as a diesel oil.
I now change my oil and filter every 7500 ks or once a year. I supose its horses for courses but my gear box is so sweet and the engine so quiet I would not use anything else.
Good riding what ever you choose
