Car Mechanics (UK)

Two-stroke ad­di­tive

- Andy Sc­ho­ley Iceland · Tonga · Belarus · Škoda Superb · Skoda Auto

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.

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