I work at a Catterpillar dealer and I would be very carefull listening to "truck drivers". There are alot of very intelligent truckers out there but some of these drivers have a difficult time putting there pants on the right way!

Atf is added to the fuel tanks to prevent "waxxing" of fuel. Pariffin wax solidifies in the fuel at about -10 deg f. plugging the fuel filters. Our300sdl has a thermostaticly controled fuel heater and the fuel tank is in the car so I would'nt think you would need any fuel additives. Water in fuel is the most common problem with fuel filter pugging but most people think it is jelled fuel.


If you have a problem with your engine running rough it is a mechanical problem. Dumping in additives will only mask the problem. It is posible that you got some bad fuel but unlikely. Maybee you have a bad nozzle, low fuel pressure,low compression, plugged fuel filter or something wrong with an individual pump.

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87' 300sdl