Def a must for the tsi engine.. what I found to make huge diff is spark plugs and fuel filter.. They say 40k for spark plugs. I do mine every 20k and APR even says if ur tuned do it every 12-15k. I found it to be overkill.. Every 20k for 50 bucks it's perfect to keep ur car running at top peak all the time
Pros: keep car running at peak
Cons: fuel filter every 20k
Vehicle:
Audi A4
Mileage: 32186 km
