Watch out for waxing, diesel drivers warned

With -20°C forecast in some parts of the UK, the Institute of Advanced Motorists is warning drivers of diesel vehicles to remember that their fuel can wax over in extremely low temperatures, which could damage the fuel filter and cause a breakdown.

Neil Greig, the Institute’s Head of Policy and Research, said: “Waxing is the formation of crystals in the diesel which block the filter. If you drive a diesel vehicle, try and park in a garage or sheltered area, and try to not to leave your vehicle standing unused for too long. If you can’t park in a garage, let the engine idle for ten minutes before driving off, as this will let the heat from the engine warm the filter and pipes.”

Lorries with exposed fuel tanks and fuel pipes are most at risk, but cars and vans can also be affected if it’s cold enough.

Water in diesel fuel tanks and filters can also freeze. Neil advises: “Keep the fuel tank full and, if possible, fill it before arriving at home as this will prevent the build up of condensation on the inside walls of the tank, helping prevent water building up in the bottom of the tank.”