CMS Oil Company is conveniently located off I-69 at the Lake Nepessing exit #153 in Lapeer, Michigan. In addition, we operate 3 Marathon convenience stores located in Elba, Metamora, and our Fueling Center in Lapeer, which our main office is attached to. Please contact our friendly staff for any of your fuel product needs or questions.. *Gasoline,Diesel Fuel,Fuel Oil,Kerosene and Biodiesel. Oil and Lubricants. Fuel Storage Tanks. Budget Payment Plan. Automatic Payment Options. Paperless Statements.