Hello, I have a C-Max 1.8 l, 120 hp, 03/04. Does anyone have experience with liquefied gas? You could then refuel for 56 cents. It should give me silver valve covers at Ford engines and with black ones and these would not be so well suited for gas, that must be related to the valves because gas does not lubricate as well as gasoline or the combustion is hotter. I would be grateful for Enlightenment. Gerhard11