I am sorry if this thread was already posted, but I couldn't find it.
Here is my question:
Is it true that you shouldn't switch dino oil to synthetic oil then back to dino oil in your Wing or any other motorcycle engine? If this is true, what is the reason?
I also know the newer engine are tighter and need sysnthetic oils in automobiles, but are the newer motorcycles engines being made tighter to pass EPA rules like the automobile engines?
Thanks for your input!