Quote:
Originally Posted by Blue Angel
This car must have a very effective EGR system then, because I have put about 15,000km on it since buying it a year ago and have yet to top up the DEF tank. That, or the DEF tank is just huge?
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It's usual for the tanks to hold enough DEF for such long mileages, but it's also worth to consider cars often resort to both EGR and DEF while heavy-duty trucks and buses usually have either one or another, so a car would use fewer DEF proportionately to the fuel consumption, even though the DEF tank of a truck might hold a volume proportionately closer to that of the fuel tank.