Create methoxide. This is extremely toxic and flammable. Make sure you work in a well ventilated with a mask and goggles. Do not breathe fumes or get any of this material on your skin or clothing. Measure 250 ml of methanol (Heet) in the jar. Measure 4 g NaOH (sodium hydroxide) into the jar, screw the lid and gently swirl the mixture until the lye is completely dissolved.The temperature of the pot will grow as you continue to mix. This process should take about 10 minutes.

Heat 1 liter of cooking oil to 140 degrees F. New Use the thermometer to make sure the temperature is correct. Do not allow oil to get a temperature above 140 degrees. Add hot oil in 2-liter bottle. Make sure the bottle is completely dry. Do not let water come into contact with the chemicals in this process.

Pour the methoxide in the 2-liter bottle containing hot oil. Complete this step in a well ventilated as the fumes from this process are extremely toxic as well. Screw on the bottle and shake vigorously for about five seconds. Allow the material to rest and repeat this operation three times more than an hour.

Set the bottle on the counter and allow the mixture to be separated over two days. Glycerin, a dark brown material, settles to the bottom of the bottle, and the clear yellow biodiesel floats to the surface. The process will begin almost immediately, but it will take one or two days to remove the turbidity of the biodiesel.

Wash the biodiesel blend with water to ensure that all contaminants are removed. Gently stir the water in your bottle. This will create soap molecules in connection with the glycerin and allow contaminants to settle. Biodiesel turns orange during this process. Repeat the washing process five or six times, allowing it to settle overnight between washes.