Read page 271 of your owners manual concerning gasoline blended with MMT, it is very detrimental to our engines. I asked several gas station owners if they have MMT in their gas....Shell, Exxon, Chevron etc. I COULD NOT GET A STRAIGHT ANSWER FROM THE OWNERS. Check the following link....http://www.edf.org/article.cfm?contentID=1159 Does anyone know any chemist that works in the oil refinery business ??