Replace the plugs with NGK or Denso.
I have the OEM RS7 plugs in my car for 40,000km ever since going to stage two with zero issues and will buy them again.
I bought NGK-94833 spark plugs from FCPEuro for my 2015 Jetta with the 1.8T.
I run NGK iridiums in my vehicles due to them being turbo/supercharged.
Stick with NGK for plugs, its the OE manufacturer, Bosch or Denso are good second choices. Never touch autolight or champion
Change spark plug to ngk iridium.
they certainly look to be different heat ranges. do yourself a favor and stop going to the dealer for spark plugs. the only different between the dealer spark plug and a big box store spark plug is that one does not come with the VW logo stamped on the side of it. they are otherwise the exact same plug. just go get yourself some new NGK's (all 4) and put yourself at ease.
I used NGK plugs in mine. A bit expensive, but they work great and I get 6 litres/100km for fuel mileage.
Previously done NGK Plugs, (PLEASE RECOMMEND ME A GOOD ONE)
On my stage 2 mk7 I swapped around and tried a few like ngk and the ngk failed causing misfires like crazy on acceleration. Back to OEM and never had another issue for 45k miles.
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