Owner reviews for spark plug

I've run Bosch iridium's in all my vehicles (boosted and daily). No gapping needed.

I just replaced mine, at 80k, with Denso PLatinums. The same brand as the stock plugs.

Autolite is the brand I got through rock auto.

I have been running them for 50,000 miles with is20 then is38 setup. Work perfect.

I just ordered new spark plugs and an oil filter as well.

These were actually alright spark plugs. The ceramic is a lot tougher than normal ceramic, and the electrode is larger. They were marketed as 'truck plugs', but they're really good in old tractors and farm equipment. They last forever.

I just did the change myself on my Gen 1 Mazda 3. It's simple! I used NGK Laser Iridiums.

For what it's worth, I've changed my plugs twice (OEM to Denso to Beru-RS7) and never noticed any oil or any difference in color between the plugs.

I’m IE stage 1, had the plugs changed to rs7 plugs I had been waiting to Install (they were early versions) not long after, left the shop and had horrendous misfire. Limped back to the shop and got OE plugs back in and it worked fine.

Yeah I own and operate an auto repair facility and refuse to use Bosch plugs because I’ve had a lot of issues with them in the past. Misfires mostly.