When you talk about adding anything other than diesel fuel to diesel fuel, you need to take in account the age of the engine. The newer ones, like really new ones, don't add anything but conditioners, old ones can run on anything that is combustible. If it is flammable, you can burn it, but take it from a diesel mechanic, don't think you can just switch over anytime you like, some tuning and set up is necessary.
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