Car Mechanics (UK)
My car is a 2014 Skoda Superb 2.0 TDI. The garage I use is advising me to occasionally put two-stroke oil in the fuel tank when full, saying it will benefit the engine. Is this true?
The first point I would make is that two-stroke oil is designed to lubricate two-stroke petrol engines, not four-stroke diesel engines. There is an urban myth which is spread by many online forums that adding twostroke oil will enhance the lubrication of the fuel pump and injection system. I have seen no scientific proof of this and all of the positive reports are unsubstantiated. Neither the manufacturers of the oil or the producers of the engines recommend it, which is enough for me to say that I would not use it. The oil will burn as it goes through the combustion chamber and add to the build-up of soot in the DPF.