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Tailpipe colour

by CAR magazine on 10/02/2011

Comments: 0

As an Audi 2,0 TDI driver I have the following question on the new TDIs (also some Volkswagens). I've picked up that the exhaust tailpipe colour on some are almost white – the same as in the older days with leaded fuel after a long journey. What is the reason for this? Is it only applicable to a certain brand of diesel? No dealer seems to be able to explain it.

S van SCHALKWYK – By e-mail

A white deposit, or even white smoke, on a diesel engine normally indicates water droplets mixed with unburned fuel. This occurs quite normally after a cold start, but goes away as the engine heats up.