Most helpful critical review
25 of 30 people found the following review helpful
UPDATE: NOT Worth replacing OEM plugs
on February 11, 2012
If you're up for a tuneup, these plugs are worth replacing the OEM plugs. My engine runs smoother and throttle response is noticeable. Don't expect miracles, like a sudden increase in MPG. You're not turning your car into a hybrid; just replacing old copper core, single arm plugs with a new material for better spark...with "hopes" of better performance. It's not much more expensive than copper plugs so it was definitely worth a try.
This model was a direct replacement for my aging 1996 Infiniti I30 V6. No problems with install but make sure to buy the anti-seize lubricant.
UPDATE: Took my car to the shop for other work and after pulling these plugs, they said this model 4501 was the wrong one for my 1996 infiniti i30. But Amazon's make/model filter listed that these work and they fit fine. Maybe the 4 electrodes makes the plug run hotter that may not be good on my old car? Not sure....I'll keep them in for a little while longer.
UPDATE #2: Sept 15, 2012. So a little over 6 months (5K miles) of running with these plugs, all of a sudden, my car stumbles on acceleration. After Googling for possible answers, came up on a few complaints about Bosch plugs failing. I replaced them with some single prong NGKs Vpower and the problem went away. The Bosch's didn't look like they failed but it may burn too hot for my old car. I'm glad the problem wasn't serious. I did receive my $4 rebate check so each plug ended up net $2 so not worth it going through Bosch's product guarantee return process (they don't cover S/H). Read that they discontinued these plugs and using the rebate to get rid of dead inventory. It may work for you but I would stick to something closer to OEM like NGK or Denso if I were you.