Just F.Y.I..... Amsoil makes a 5w-40 full synthetic. A friend of mine put it in his 2002 Dodge CUMMINS powered and loves it! He went on a trip to Texas and back and averaged 20mpg on a 3/4 ton 4X4 with an automatic at 70-75mph.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.