No, I'm asking because I start the truck on diesel, then switch over to the front tank, which is usually full of waste oil. And as it has been getting colder out, I'm finding that the waste oil is almost too thick for the fuel pump to keep up with the injection pump, leaving me with a truck that sometimes doesn't like to pull hills, but if the day is just 10 degrees warmer, it flows better by just enough to run fine on 100% straight oil. Big savings in fuel cost department. So i'd like to find a way to heat it so I can continue running it through the winter, without doing the whole running of coolant lines to the tank, and putting a coil inside it. There has to be a more effective way than this. thanks