I’m 90% sure my EGTs came with Bosch plugs, switch to NGK that are 2 steps colder for my tune haven’t had any issues with them for about 25k miles
Pros: no issues for 25k miles
Mileage: 25000 km
Owner reviews for spark plug
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OE plugs for this engine is NGK Laser Iridium. Hyundai/Kia usually use either Denso or NGK plugs.
Vehicle:
Hyundai Sonata
I'd get OEM wires and NGK iridium OEM speck plugs.
I ended up finding a post where somebody was having a similar problem that I was and one of the top comments on that post a guy had said word for word "I hope you don't have Bosch Platinum plugs in there." I ordered NGK ZFR5N copper plugs. I just received them this morning and got work. Gapped them to 0.035. Put them in. Done. Misfire gone. Runs perfect idles like butter.
Pros: misfire gone, runs perfect
Cons: caused misfires
Vehicle:
Jeep Cherokee
On any of the gas trucks with the "modular" engine family (4.2 V-6 and 4.6/5.4 V-8) it seems like if you use anything other than Motorcraft spark plugs and coil packs, the engine won't run right at all, no matter the brand.
Cons: engine won't run right
Vehicle:
Ford
I've been using beru rs7 plugs without any issues.
Pros: no issues
Went with the fancy ngk plugs. A man of culture. I put those in my Volvo and they say it's heresy.
Vehicle:
Volvo
I recently just replaced my spark plugs they were past due. So I bought the OE Bosch 9683. The engine runs fine, starts easy, no misfiring, no rough running. But after the plug change I am getting much worse millage.
Pros: engine runs fine, starts easy
Cons: worse millage
Vehicle:
Mazda 5
Mileage: 108500 km
Part number: 9683
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
I own one of these, and I couldn't have a lower opinion of Fords engineering (the 2v spits out spark plugs? lets "fix" it on the 3v and make it so they will never come out).
Cons: poor engineering, spark plugs get stuck
Vehicle:
Ford
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