It used to be that wide VI == bad, because it meant more VI modifiers and less lubrication. (Plus the additives broke-down and became sludge.) Does no one think too many VIM additives could be a bad thing?
Speaking for myself I always try to pick the oil that has no VIMs. For example: Amsoil 5w-20 which is innately wide VI without modifiers.
Speaking for myself I always try to pick the oil that has no VIMs. For example: Amsoil 5w-20 which is innately wide VI without modifiers.