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If your topping it up with distilled water it might be worth getting a coolant freeze temp kit from halfords. They are only about £2 but will tell you at what temperature the coolant will freeze (the more water in the mix the higher the freezing point).

Coolant should be between min-max when the engine is cold, it will rise when the engine warms up. I would check you don't have any leaks, top the fluid up and see if you are losing any.

Just found this post on pistonheads about the dpf regen, worth a read. Those that keep having the regen occuring at odd times may need a new sensor? Generally the way it works is the cars DPF pressure sensor tells the ECU how blocked the DPF is when it get slightly clogged it does a sort of...

Are you driving at 2500rpm on the m'way? If your cruising in 6th there may not be enough load on the engine? Just theories by the way, i'm a new audi owner so this is just from what i've read online. Im sure it said it shouldn't do the re-gen when the engine is cold either :S but i think you...

To re-gen the dpf you need to drive the car for 20mintues at about 2500rpm to get enough heat into the filter to burn off the soot. Try driving in 5th on the m'way for a while. There will probably be a fair bit of black soot coming from the exhaust when it re-gens itself(nothing to worry about)...