dynaguy: I use all Red line products (even 2 stoke oil in my d-bikes). I have ment the CEO once for Red Line @ a show. He said that all synthetic oils contain much of the same ingredients which all come from the same central supplier. Many synthetics have different levels of ingredients however. Like Double-D said, it is the purest synthetic out there. As you probably know, some others have petrolium ingredients too. I run 20/50 Red Line in my BBC. As noted earlier, it has a higher "sheer wear/ viscosity" rating that the others. Good luck Scooter