Spark plug Bosch or NGK
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.
NGK (Mazda OEM) or Denso are my picks. Personally I think both brands are as good as each other. I buy whichever is cheaper that suits my car.
I bought these when I did my last tune up and plug swap just to try. I noticed zero difference in power or mpg.
Replacing a motor is not fun, nor cheap. That was with 9006 RS7's btw (your current plugs).
I bought some NGK from RockAuto and they only lasted me 15k miles. I just ended up buying the FoMoCo ones from the dealer.
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