I have a customer who runs his 1986 Mercedes Benz 300D on used cooking oil. He initially started with a twin tank system that started on diesel, then switched over, but now puts it straight in the fuel tank.
I am forever replacing fuel filters for him, as he must be a bit lazy / complacent when it comes to filtering the oil. So much so that his maintenance costs would have bought him a lot of diesel fuel, although for him it is an intellectual excercise, rather than a purely fiscal one.
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