Owner reviews for spark plug

I was told that the Motorcraft iridium's are made by NGK?

I put denso 5310 in mine, apparently they are supposed to give you a slight increase in power if you use premium fuel.

Idk if I gained any power, but the car runs well.

You're on the right track- replace those worn out plugs. Pre-detonation started on my '18 at 30k. Increasing octane rating to 93 worked up to 58k miles. $50 for a new set of [Autolite Iridium XP5363](https://www.amazon.com/dp/B078KWTCF2?ref=ppx_pop_mob_ap_share) resolved this problem.

I opted for the NGK DIFR6D13, since these were suggested by a local Honda dealership. These seem to be perfectly fine for the CR-Z. No complaints at all.

Bosh Double Iridium is the best value. AC Delco as well as the NGK only have an iridium electrode. The Bosh plugs have iridium laser welded to the ground electrode as well. The advantage is that it stays cleaner when it gets up to temperature and will have virtually no wear. Don't get Autolite. Their plugs are almost always out of spec. Out of the box you can ohm them out and 1 of the 4 is guaranteed to be out of spec.

I've been running the NGK "rs7" plugs 06K905601M in my wagon since I went IS20 with an APR stage 3 91 tune. Stock gap out of the box was .026. I've now put about 6k on them and have had zero issues.

I have NGK ruthenium’s and it is noticeably smoother at idle vs iridium’s. Literally zero idle “pop” or misfires

I changed spark plugs to NGK laser platinum plugs with a 0.32 gap. The issue only arouse after I got the tune.

Don't even think the Autolite or Bosch last as long as Denso/NGK spark plugs.

autolites were fine 100 years ago

now stick with NGK or whatever OEM was. its not worth it to be fudging around and what little your gonna save may be burned up in less MPG using some other plug.