Spark plug Denso or OEM Mazda

I like ac delco. But I recently used denso tt fine wire plugs I two different ls engines. What a difference in power. And gas mileage.

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

Denso Iridium 1 step colder plugs. Running great on my 2017 Jetta 1.4T

Get the oem denso ones. There is nothing better than oem for that kind of thing.

This is what a 202k mile spark plug looks like on an 2013 Lexus gs350 daily driver. Pretty impressed with it overall. All 6 plugs look exactly like this.

For spark plugs, denso or bust

I've been running Denso (5346) IKH24 Iridium gapped .024 on APR stg1 for 48k miles and most recently on stg 2 with no issues.

Denso TT iridium are so far the best ones I’ve tried in terms of performance

No discernible difference to me, positive or negative. But since I am running APR stage 1, I followed APR's recommendation.

The original dealership where I bought the van installed Denso spark plugs part # SXU22HCR11S which were supposed to have a gap of 0.044 but they all had either 0.039 or 0.040. Apparently no one checked the gap before putting them in.