I use these in my IE stage 1 MK7. I replace them every 20k, zero issues so far. They could probably go another 10k miles, too, I just replace them early to avoid the ground strap issue that seems to be prevalent.
When I order NGK spark plugs, I get NGK spark plugs, not some copy.
The AC Delco Iridium are fine failing that anything NGK the NGK ruthenium work well. Or the NGK Iridium
I replaced all spark plugs with Genuine Audi NGK plugs and replaced all Ignition Coils as well.
After changing: Idles better and more consistent at 700~800 rpm range. Car drives smoother? Changing spark plugs made it visibly better.
NGKs are my go to’s
I've run Denso and NGK on E85 for 10k+ miles and numerous track days, with zero issues.
95K, swapped for NGK laser iridium’s (OEM replacement) plugs and since then have had rough idle but when driving feels fine.
I’m lucky if I get a full 5k miles out of a set of ER10S before one of them shits out and I get a misfire.
I changed my plugs for NGK IRs but now I have a rough idle when the engine warms up.
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