Diesel Bug is not restricted to veg oil mixes. We get it in the boats all the time. Most boat yards keep biocide of various sorts. Half of them promise to re-dissolve the contamination but I don't believe it. They will at least kill it. Once its there though, unless you can steam clean the tank etc, its very difficult to get rid of completely.
As regards waste oil, I would try and avoid hypoid gear oil. Its got sulphur in it and I think it can leave some acids behind when it burns. Unless someone knows different of course.
As regards waste oil, I would try and avoid hypoid gear oil. Its got sulphur in it and I think it can leave some acids behind when it burns. Unless someone knows different of course.