This story is in several threads already so I will try to shorten it. Dole, the Fruit Company tried mixing and burning waste Oil in their Diesel Generator Sets that run the Refer Units on Refrigerated Containers.

A white crusty residue started to plug up the Injectors on their Engines and the expense of repair got above the savings in burning the Waste Motor Oil.

Motor Oil has additives and such that are supposed to inhibit burning and are not in of themselve fuel; they can not be filtered out.

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84 300D, 82 Volvo 244Gl Diesel