Once you've got an idea of the dosing strategy based on your usage you'll be able to judge when it'll be due some. Defo a good idea to fill it up when it asks for it, rather than just adding a bit.
I don't think you can do any harm by topping it up if you knew you were driving over 2k miles and didn't want the aggro, but as above most filling stations stock it these days, often from a pump nozzle dispenser. The challenge can be getting it in the car if the filler isn't that accessible!
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
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