The AC Delco Iridium are fine failing that anything NGK the NGK ruthenium work well. Or the NGK Iridium
Pros: work well
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I replaced all spark plugs with Genuine Audi NGK plugs and replaced all Ignition Coils as well.
Vehicle:
Audi A6
I switched to brisk just because of the high amount of ngk knock offs and they are supposed to last a bit longer and or have less wear than the ngk I'm a step colder rr4ys they have been great.
Pros: great, supposed to last longer
Cons: high amount of knock offs
I recently was having a misfire in cylinders 2/3, and new plugs and ignition coils cleared it up.
Pros: cleared up misfire
After changing: Idles better and more consistent at 700~800 rpm range. Car drives smoother? Changing spark plugs made it visibly better.
Pros: idles better, drives smoother
Mileage: 215000 km
NGKs are my go to’s
Pros: go to
I replaced the OEM plugs with NGK, they lasted about 15,000 miles. Burger Tuning told me that 15k is about all you'll get out of NGKs in these cars.
Cons: short lifespan (15k miles)
Vehicle:
Kia
Mileage: 15000 km
I don't use spark plugs like that unless the vehicle specifically specs for them. We used to put Bosch W7DTC's in these, or at a minimum, just the single electrode version.
Vehicle:
Volkswagen Jetta
Hope you screwed them in with the correct torque, unlike my VW dealer. They started to unscrew themselves and causing instant misfire and rpm drops to 200 and engine shutoff.
Cons: misfire, rpm drops
Vehicle:
Volkswagen
I agree with everyone saying NGK but I would also like to recommend you do not buy an autolite if you need a substitute, they have horrible quality control.
Cons: horrible quality control
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