Use a quality diesel fuel from reputable suppliers which has been specifically formulated for vehicular use. The diesel engine in the truck line is designed to operate on either No. 1-D, No. 2-D or winterized No 2-D grade fuel. For best economy and performance, a No. 2-D fuel should be used at all temperatures above 20°F. At lower temperatures, either 1-D or winterized 2-D should be used to avoid wax (paraffin) plugging the fuel filter. This can result in the engine not starting on a cold morning.
To avoid severe damage to the engine, do not mix gasoline with the diesel fuel. Do not use household heating oil or any diesel oil intended for use in marine or industrial engines.
The fuel filler cap and lid have labels stating DIESEL. In the event of gasoline being pumped into the tank by mistake, DO NOT attempt to start the engine, even to leave the pump area. If the vehicle can be towed and the tank drained before the engine is started, great damage and expense will be avoided.
No solvents or additives should ever be mixed with the diesel fuel. Damage to seals, gaskets and the injection pump can result.