Greetings good people of the forum. I have an unusual issue I'm requesting guidance from the knowledgable and experienced. I recycle waste plastic and oil to diesel by thermal cracking methods refineries have used for 100+years. To explain briefly, the waste hydrocarbon mixture is heated to its' boiling point and evaporated. By means of reflux and series condensers I'm able to fractionate a nice diesel product from the vapor. One issue is the formation of gum which I discovered in various parts of the plant and vehicle fuel systems. Research points to oxidation as the cause. It is partially dissolvable in xylene, gasoline and diesel but easily dissolves with methanol. Because my diesel is refined from hydrocarbon it has no additives and this aspect forms the basis of my question. Please advise a suitable additive package to deal with the various issues, in particular: Antioxidant to stabilize and inhibit gum formation. Solvents to clean the system of gum and other deposits. Other additives as may seem beneficial. I operate on a hobby status and make fuel for my own use only. Indeed far more time has been devoted to the building and running than anyone could imagine. Please advise. Thankyou.