Millers, i swear by millers. Before the cupra I had a mk1 fabia vrs TDI and the millers additive changed the car. less smoke more responsive and just cleaned the whole thing. I now fill the cupra with momentum 99 and add petrol millers.
I used Forte first (Diesel Turbo Cleaner, Fuel System and DPF) in a triple shot... I figure once powers been "restored" everything else is a waste really ... but since I've used Millers and Wynns and noticed no difference...
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