vs
Spark plug Autolite or Denso
And, before you get too far, are you replacing with the right plugs? I presume it’s the 2AZ 4-cyl since you’re not asking us how to get to the back plugs. The right ones are the Denso Iridium Long Life or the NGK Laser Iridium.
I have autolite xp in the van. $100 for 6 ngk, $90 for denso with a van with 250k miles. Everyone says there crap, but it runs great.
Pros: runs great
Cons: everyone says there crap
Mileage: 250000 km
I use Denso IK20TT and these spark plugs work every time, on both fuels.
Pros: reliable on both fuels
Vehicle:
Volkswagen Golf
I put Autolite Iridium plugs in my '06 N52 20k miles ago because of a crazy sale/rebate. It runs as smooth as a new one.
Pros: runs smooth as new
Vehicle:
BMW
Mileage: 32186 km
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.
Pros: car runs well
Cons: power increase uncertain
Part number: 5310
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.
Pros: resolved pre-detonation problem
Vehicle:
Ford
Mileage: 30000 km
Part number: XP5363
I just installed a set of Iridium XP 6203 in my Optima 2015 and they're working fine. Gap was incorrect on 2 of them, but was easy to fix.
Pros: working fine
Cons: gap was incorrect
Vehicle:
Kia Optima
Part number: XP 6203
Don't even think the Autolite or Bosch last as long as Denso/NGK spark plugs.
Cons: do not last long
Vehicle:
Toyota Camry
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.
Cons: less MPG
I've had nothing but bad luck with Autolite brand.
Cons: bad luck
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