And, before you get too far, are you replacing with the right plugs? I presume it’s the 2AZ 4-cyl since you’re not asking us how to get to the back plugs. The right ones are the Denso Iridium Long Life or the NGK Laser Iridium.
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To be honest the last plug VW went with , the 101905601F (OEM clones Bosch copper nickel FR7HE02 Or NGK ZFR6T-11G (5960) Copper Nickel, Beru BRU-Z272 copper nickel ) for the 2.5 is best. It’s one shade cooler and will have less spark knock. You have more timing.
Pros: less spark knock, more timing
Vehicle:
Volkswagen
Mileage: 40000 km
Part number: 101905601F
I forgot to mention that I installed brand new pre-gapped NGK spark plugs two years ago
I like NGK, but you can't go wrong using what the manual calls for.
Pros: can't go wrong
Champion and NGK have good reputations.
Pros: good reputations
Ngk’s are hard to beat.
Pros: hard to beat
I have Seat Leon FR 2.0 TFSi 2007 DSG F1 165k KM, stock engine, and stock map, only things I've done since I purchased it were: spark plugs NGK
Pros: NGK spark plugs
Vehicle:
Seat Leon
Mileage: 165000 km
Bought mine from rock auto; got the Bosch ones since the NGK’s are really only recommended if your car is tuned
Auto lite is garbage now. NGk is the way
Pros: NGk is the way
Cons: Auto lite is garbage
when I worked for a Chevy dealer we hated Bosch plugs. Chevy's just don't seem to like them, they were often the culprit in misfire diagnosis.
Cons: often culprit in misfire
Vehicle:
Chevrolet
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