I have read many posts that allude to Rotella oil as a good oil to use. Today at the dealership the parts guy said Rotella was not a good oil to use on our motorcycles and I should steer away from using it. Has anyone heard that before? He said it was a diesel engine oil not to be used in motorcycles and I should look at Motul, Amsoil, or yamaha oil...hmmm, as far as I know Rotella is fine.