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Terry Buscombe ASKED THE GUIDE

Detergents in premium diesel

I recently filled my Alfa 159 diesel with Caltex Premium Diesel, which I believe only has a detergent to clean fuel lines/injectors etc, but I swear after two days the car is running better. The small amount of turbo lag it had seems to have gone, and it seems to accelerate better. Is that something you would agree, or is it my brain playing tricks on me?

Graham Smith ANSWERED BY Graham Smith
21 September 2012

Premium diesel does have a detergent in it to cleans the fuel system, which could be why you are feeling an improvement in its running.