Carter, I have that model and the tank is out of proportion to the North American prototype. It also lacks the hose reel in the rear that makes modern home heating oil trucks so distinctive.
Daniel,
I also have the truck, and I am not sure what you mean by "out of proportion for the North American prototype." Fuel oil tanks come in a variety of shapes, with some more oval than others, depending on the manufacturer of the tank. I realize the tank on this truck may not work for the prototype you are trying to model, but it might work for someone else.
The TomyTec tank is about 8.5 N scale feet wide (1:160) and about 15.5 N scale feet long (1:160). The tank on the co-op fuel truck that delivers diesel to my farm looks very much like the tank on the TomyTec model.
True, the hose reel would need to be scratch built if you need one, and a few other minor modifications may be required, but until someone makes a better fuel tank, this one has kitbashing possibilities.
Carter