Why Waste Vegetable Oil?
Most diesel car engines are suitable for the use of waste vegetable oil (WVO) with appropriate oil purification and suitable fuel system modifications. Principally, the viscosity and surface tension of the WVO must be reduced by preheating it, typically by using waste heat from the engine or electricity, otherwise poor atomization, incomplete combustion and carbonization may result.
One common solution is to add a heat exchanger and an additional fuel tank for WVO and to switch between this additional tank and the main tank of regular diesel fuel. The engine is started on diesel, switched over to WVO as soon as it is warmed up and switched back to diesel shortly before being switched off to ensure that no WVO remains in the engine or fuel lines when it is started from cold again.

In colder climates it is often necessary to heat the vegetable oil fuel lines and tank as it can become very viscous and even solidify.

Recycled vegetable oil, also termed waste vegetable oil (WVO), used cooking oil is recovered from businesses and industry that use the oil for cooking.

As of 2000, the United States was producing in excess of 11 billion liters of recycled vegetable oil annually, mainly from industrial deep fryers in potato processing plants, snack food factories and fast food restaurants.

Use of used vegetable oil as a direct fuel competes with some other uses of the commodity, which has effects on its price as a fuel and increases its cost as an input to the other uses as well.
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