To break in say... a 3W or DA 150, we all pretty much agree to run a petroleum based oil-gas mix before switching to a synthetic like Amsoil. (not that you need to swithc to a synthetic, but this is the hypothetical situation). We have been told to do this for a certain amount of time OR gallons. How much time or how many gallons. I've heard as little as 4 gallons, and as much as 12. Let's hear it.