This article is for those who are a little more experienced at
making biodiesel at home and who wish to progress from using
straight vegetable oil to waste oil. As users of biodiesel fuel
know vegetable oil will react very similarly to diesel fuel in a diesel engine. Like diesel fuel, biodiesel will ignite when
compressed causing air in the engine cylinders to expand. This is
the energy that pushes the engine pistons into motion.

The reason you must make biodiesel is that if you burned straight
unprocessed oils in the diesel engine it would simply congeal and
then clot your fuel injectors and engine like cholesterol hardening
human arteries.

Read more on how to Make Your Own Biodiesel

There are many biodiesel recipes for removing the fatty acids from oil.

Here is a very common and reputable recipe for making biodiesel at home from waste oil.

You will need:

Used or fresh vegetable oil (that has been strained so that it is free of particulates such as food crumbs)

Lye
Methanol
Isopropyl Alcohol (99% IPA)
eyedropper- or other type of 1 milliliter dropper
PH paper (to test for acidity )
an old blender
plastic or glass measuring cups or beakers, with metric measures–
and/or a gram scale
plastic, glass or stainless stirrers and spoons,
plastic buckets

1. Dissolve 1 gram NaOH (Sodium Hydroxide- Lye) in 1000 ml. of water. This is your NaOH solution.
2.

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