It can't possibly be the "best" since Amsoil is the "best"....or was that Mobil-1? Valvoline makes a good product too. But then theres my buddy who put 416,000 miles on his early 80's Harley with nothing but plain old Walmart Castrol dino oil. And thats only a fraction of the miles he has put on motorcycles and scooters...with Castrol being his favorite. :roll:
I like synthetic, but don't ask me to prove its the best. Just makes me feel good to think maybe its better than regular stuff, slicker, less friction, less heat buildup, :wink: :wink: .......despite those 416,000 miles mentioned above.