Hello, I have a '56 Evinrude 3hp "lightwin" that I run about 8-10 gallons of gas(less than 5% ethonol) a year through. I mix in Sea Foam and red Stabil in each gallon. I saw the Marine Stabil and thought I'd switch, but at cost twice as much and it will go bad after two year before I even use 25% of it. Is it something I really need to use or will the Sea Foam and Stabil "red" work just fine ? -Thanks