Relative to motorcycles, but that is not really at the crux of my question; a friend recommends against using 5-4- Shell Rotella T Syn in motorcycles (we have GL1800 Honda cycles) because the base stock is 5 weight and the oil will somehow be too thin. I think his case may hald a little water with conventional oils that rely upon VI to extend viscosity range upward, but I was also thinking that this particular oil is not formulated with reliance upon VI. I will be reading through the archives here as this is my first post. But can any of you shed some definitive light upon this subject?
prs
prs