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

Autolite › Spark plug

arrowsmith_joe 20 Oct 2022, 20:09

Rating 5.0

Acceleration:

I've ran Autolites on my racecar that runs in the 7's for 20+ years with no problem. They are the only thing I trust at the moment

Pros: trustworthy, no problems

Autolite › Spark plug

NashvilleHillRunner 9 Jul 2022, 20:41

Rating 5.0

I used them in my 2007 Tacoma with no problems. Left them in for several years.

Pros: no problems

Vehicle: Toyota

Autolite › Spark plug

EnzyEng 4 May 2022, 01:44

Rating 4.0

Starting:

I put autolite's in my 2010 V6 and they've been perfectly fine.

Pros: perfectly fine

Vehicle: Ford

Autolite › Spark plug

DZello 22 Oct 2019, 18:02

Rating 3.5

Starting:

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

Autolite › Spark plug

thefriendlyjerk 15 Aug 2025, 00:24

Rating 1.0

I would never install Autolite on any car, definitely not the WRX.

Cons: never install

Vehicle: Subaru

Autolite › Spark plug

SubiePros 1 Aug 2025, 03:33

Rating 1.0

Starting:

Out of all my years replacing spark plugs. The only times I got bad spark plugs that misfired right away is the one time I ordered a fake set thru ebay(my fault for not doing my due diligence) and a set of brand new auto lites from autozone.

Cons: spark plugs misfired

Autolite › Spark plug

VVULFPELT 31 Jul 2025, 23:30

Rating 1.0

Idle:
Acceleration:

I purchased some Autolite XP Iridium spark plugs earlier this month and immediately installed them. Within a mile of driving, the car started shaking violently and the check engine light came on. I immediately turned around and reinstalled the old plugs and the problems went away.

Cons: car started shaking violently