Owner reviews for spark plug

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.

At least with double iridium ACDELCO on the c5. It’s 100k intervals.

Fomoco plugs are actually pretty good. I replaced my Ford Escape with some more expensive Bosch and had misfires immediately. Got some Fomoco’s from O’Reilly and haven’t had an issue since.

I used NGK plugs in mine. A bit expensive, but they work great and I get 6 litres/100km for fuel mileage.

Bought a 03 100 series with 241,000 only issue was the number 7 spark plug blew out, had to re-tap it and install a aluminum sleeve, and replace the coil

I bought Autolite spark plugs but after researching I should of bought NGK. Right after replacing them when I accelerate my car jerks or misfires when driving. When at an idle I felt my car jerking.

Had some Denso plugs in my '15 WRX (unaware to me) and the plug in cylinder 2 was fouled within 7k miles and caused a misfire. Turns out the shop that the previous owner took it to for the 60k-mile plug change decided to cheap out. I now have OEM plugs :D