I did not, and bought the Denso Iridiums. I have less misfires and slightly stronger gas mileage since install. Just my experience.
Pros: less misfires, stronger gas mileage
Owner reviews for spark plug
Manufacturers
Comparisons
VAG engines seem to like their factory recommended Bosch plugs better than any other.
Pros: factory recommended
I used Bosch W4CS (cheap plug) with good results in my G60.
Pros: good results, cheap
Vehicle:
Volkswagen Corrado
Part number: W4CS
I run ngk bkr7e plugs gapped to .024 at 15psi. No probs here.
Pros: no problems at 15psi
Part number: BKR7E
I have been runing the NGK BKR7E which is one step colder than stock (NGK Part# 6097) and I have a K04 with GIAC K04 software and other mods. They work great with a .028 gap. I change my plugs every 5K.
Pros: work great, one step colder
Mileage: 5000 km
Part number: 6097
I just installed some of these NGK (BKR6E) plugs. I set the gap to .030 These went my 99 A4 1.8T Avant Quattro. The car is stock except for a K&N filter. Idle seems awesome and flawless all the way through the rev range.
Pros: awesome idle, flawless rev range
Vehicle:
Audi A4
Part number: BKR6E
I just replaced my plugs in an 89 16v yesterday. I ended up getting the Bosch platinum +2. I was leery of the platinums as everybody seems to knock them, but my car runs fine. They were 4 bucks each.
Pros: car runs fine
Vehicle:
Volkswagen Golf
Been using the desno IK24's with a .32 gap. Works very well but that plug is a tad to cold. Runs a tad rough untill I get her warmed up.
Pros: works very well
Cons: tad too cold, runs rough cold
Part number: IK24
After changing the plugs from OEM's to Autolite 3923's, the coil packs started popping up. I've read that the Autolites are smaller than the OEM's, so they don't hold on as tight...and then somebody else said this is bogus and they're both the same. Whatever the reason, the coil packs on my car do not like the Autolites.
Cons: coil packs started popping
everything else runs pretty poorly on our cars. especially the bosch +4's
Cons: runs pretty poorly
Vehicle:
Volkswagen Jetta
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