- May 29, 2007
Nothing like a good engine oil discussion! I use engine oil specifically formulated for air cooled engines. The additive package is different in these oils. Air cooled engines run hotter. To make up for the cushioning/lubricating effect missing in modern oils I add ZDDP to the engine oil. Doing this to help prevent valve train and metal to metal friction problems. Check out engine builder mag for a better explanation. I believe Zinc was removed because of catalytic converters issues. And I add a little MMO to the gas tank.