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DON'T use Millers Sport 4 - it will be fine for your car, but this is now obsolete, and it does degrade over time (it says so on the bottle). Hence it may be old stock.
The new type is Millers Ecomax, which is around the same price (£8-£9 per 500ml bottle). This, at normal dosage treats 500 litres of fuel, although Millers recommend double strength for the first dosed fill-up.
My experience with Sport 4 is that it did leave a black deposit in the exhaust tip - Millers specifically state that Sport 4 is OK for DPF's - but since using Ecomax, my tip has been clear. No other discernable difference apart from the bottle is a little more awkward to get the correct dose.
Mike
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