Asad, you are right. Oxidation might be a problem, because as the fuel flows out the condenser, it is yellow, but it turns dark brown over time and this is not the impurities, because we have the centrifugal filter now and this thing gets every solid out of the fuel and it still stays the same color. I don't know how this would work out over longer periods of time, but so far after some two weeks, the diesel fuel still is usable and works like a charm. My friend has been driving on this fuel for some time now, almost 300KM for now without any problems. Anyway, oxidizing problem can be easily solved with additives. I don't know the right brand or name yet, but it does not cost much, about some 15$ for liter, but you need to mix in only some 200 grams of the additive for 200 liters of fuel if I recall corectly. My friend will get some soon and I will post details of that stuff
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