vs
Spark plug Autolite or Denso
The plugs are great-- zero issues, can't tell a difference.
Pros: zero issues, great
Vehicle:
Subaru
Mileage: 5000 km
Denso Iridium 1 step colder plugs. Running great on my 2017 Jetta 1.4T
Pros: running great
Vehicle:
Volkswagen Jetta
Part number: 5308 IXU22
Get the oem denso ones. There is nothing better than oem for that kind of thing.
Pros: nothing better than OEM
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.
Pros: impressed with it overall
Vehicle:
Lexus
For spark plugs, denso or bust
Pros: reliable spark plugs
Vehicle:
Lexus ES
I've put about 100 miles on them and the car seems just as happy as ever. Went for a spirited drive today out in the hills and the car felt responsive and strong through the power range.
Pros: car felt responsive, strong power
Vehicle:
Subaru
Mileage: 160 km
These are Autolite plugs, not Motorcraft. Which means the plugs in this vehicle have been changed before, that probably has a little to do with why it was easier than usual to get these out. By the looks of the plugs and the lack of carbon buildup and corrosion (the two factors that cause these plugs to size the most) I'd say they weren't in there for a very long time either. Going by my experience with Autolite plugs in Fords (very little experience as I work on Euros mostly) if they don't start misfiring right away it's usually within a couple of months.
Pros: lack of carbon buildup
Cons: misfiring within months
I got some phony Denso marked spark plugs
Cons: phony spark plugs
Do not get Autolite, I've seen them cause trouble and issues in Honda engines.
Cons: cause trouble, issues
Vehicle:
Honda
Yesterday, I installed new spark plugs in my 2004 TJ. Going off [this thread](https://wranglertjforum.com/threads/what-are-the-best-spark-plugs-for-my-jeep-wrangler-tj-4-0.4196/) I purchased the Autolite XP985. Originally, I gapped the plugs to .04 based on [this thread](https://wranglertjforum.com/threads/spark-plug-gap-for-4-0.17415/). The jeep ran terribly and actually threw a check engine light.
I went back today and changed all the gaps to .035 based on the note under the hood, but I still think the idle is a bit rougher then what it was before the change.
Cons: rough idle, check engine light
Vehicle:
Jeep
Part number: XP985
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