[pacolino]

Just noticed that my dic is saying that the diesel exhaust fluid is down to 35%. Problem is, I just poured in a big jug last month. So it should be about 80% full as the def normally lasts me 5-6 months.

Is it possible that the def tank is frozen and the only fluid available is in the centre reservoir where the heater is? it could be reporting on a diminishing supply with a frozen block of fluid. With our really cold temps, I wonder if the def tank heater is up to the job...

An online search reveals that def freezes at -11 ˚C or 12 F˚. It also says that the heaters should be able to handle it.

My driving has changed to mainly around-town trips. Could I be using more def than highway driving?

Def shouldn't freeze no matter how cold is, it's the heater who's not doing the job.

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[pacolino]

Def does start to freeze at around 12 degrees Fahrenheit so it is very possible that depending on the weather conditions and time between drive cycles that it can freeze.

The heater though should have no problem thawing it back out. Try to take a longer than usual trip to give the heater more time, and see if that makes any difference.

Generally DEF usage is related to fuel usage, so if your fuel usage is going up then chances are your def usage is going up also. To determine whether you think the percentage reading is correct though will involve crunching some numbers.

When you say you poured in a big jug, did you actually see the level up at the top of the tank or just pour in what you had? Usually when I fill mine up it takes almost 5 gallons from empty.

So what do you think....def freezes while vehicle is parked for a prolonged period of time (outside overnight parking with -20C)?

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