Oem Motorcraft plugs are always my go-to. They generally last around 80k miles.
Denso and Bosch have worked well for us on a 1.6.
NGK (Mazda OEM) or Denso are my picks. Personally I think both brands are as good as each other. I buy whichever is cheaper that suits my car.
NGK laser iridiums are the ones I just put in. You don't have to do it often so the price tag doesn't hurt as much I guess is one way of looking at it. Also buying good plugs will help you NOT spend a ton more money further down the road on repairs.
In all the cars, boat motors, and regular lawn equipment I change plugs in… NGK is the best there is.
I’m running them on stage 3 with no issues APR Z1003100 APR Iridium Pro Spark Plugs - 14x26.5x16mm - Heat Range 9
Ignition system overhaul (spark plugs, wires ignition coils), a new starter like the one on amazon is a nice bandaid.
Bought some Denso 3450 Irdium plugs online. After reading about counterfits. I decided to test mine.
All are gapped .43 for the OEM spec for a 2014 Nissan Xterra. I measured the Irdium electrode tip which is 0.7mm and appears blue
Careful with Denso, back in MK7 days some complained that the plugs would shatter and cause engine damage.
Neither, I’ve seen Bosch plugs fall apart and I wouldn’t trust autolite on my lawnmower.
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