The NGK plugs are like $8ea when you buy 16. Still costs you nearly $800 less than what the dealer cost for that job is. And they last 60-75k miles.
Spark plugs do actually vary for some reason, I always use whats oem to the car. In my case thats the ngk iridium plugs (same goes for cables).
NGK or bust.
Most manufacturers don't make their own spark plugs anyway. They are usually just rebranded Denso/NGK/Bosch. I would have no concern fitting NGK spark plugs provided the part number is correct.
Use NGK brand and replace it.
There is a meteor 350 in my riding group with an iridium plug which i will say he Acquired Unexpectedly, and damn the results are just awesome.
I almost went 200000 km on my bmw between spark plug changes, and the motor runs so much better after. My fuel economy almost doubled, and performance was a night and day difference
I did my spark plugs on my 335i f30 and I can say one thing. $400 for labor on spark plugs is treason. Shit should take those "experienced" mechanics maybe an hour.
Put in new plugs which are NGK 2309 at stock gap which was recommended by my tuner. DID NOT CHANGE OR FIX MY PROBLEM.
Those spark plugs don't look like the highest quality parts. Get some from NGK or Bosch. Better made parts that are more suited to modern engines
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