Reviews of NGK spark plug

PR Score ?

Based on 763 reviews and 2360 votes

2360 votes

Average rating ?

4.0

Acceleration:

3.7

Idle:

3.5

Starting:

4.1

597

763 reviews

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NGK

Japan

ngk.de

No.1 in the rating

among 17 manufacturers

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NGK › Spark plug

BuschClash 25 Oct 2025, 05:36

Rating 3.5

I do NGK 6510 one step colder. I do 0.025”-0.026” gap. I had a shop do my last set since I didn’t trust myself. He accidentally did 0.022” and I put them in and they’ve been fine. The other set is 0.018” and idk if ima put them in. Gotta change the one step colder NGK’s at around 15-20k miles. I usually change mine when I start seeing high spark retard. I’m BT 93/E40 with aux.

Pros: perform fine, good lifespan

Cons: change due to spark retard

Mileage: 15000 km

Part number: 6510

NGK › Spark plug

Hairbear2176 23 Oct 2025, 16:20

Rating 2.5

I replaced the OEM plugs with NGK, they lasted about 15,000 miles. Burger Tuning told me that 15k is about all you'll get out of NGKs in these cars.

Cons: short lifespan (15k miles)

Vehicle: Kia

Mileage: 15000 km

NGK › Spark plug

IAmNotOMGhixD 22 Oct 2025, 18:35

Rating 5.0

I changed

- 4 new NGK Iridium sparkplugs

Pros: new sparkplugs

Vehicle: Suzuki Vitara

Mileage: 115000 km

NGK › Spark plug

Sneedevacantist 15 Oct 2025, 03:34

Rating 5.0

Now post how much they want to change spark plugs. I've usually seen dealers asking for $200-$250 on a 4 banger. Or I can buy some nice NGK plugs for under $60 and get them changed within my lunch hour in the parking lot.

Pros: nice plugs, easy install

Cons: dealer price is high

Vehicle: Mazda

NGK › Spark plug

Jasoncav82 14 Oct 2025, 23:16

Rating 5.0

Acceleration:

I run NGK Rutheniums now and they've been excellent handling 30psi of boost with zero blowout even at wider than the .024" gaps that most tuners recommend. Oh and theyre MUCH cheaper at $8/ea vs $40/ea for the NGK race plugs.

Pros: excellent boost handling, zero blowout, much cheaper

NGK › Spark plug

Lead_Bacon 14 Oct 2025, 01:14

Rating 4.0

Acceleration:

I went to colder plugs from ngk and noticed a difference in shift pattern for the better (my car is an auto).

Pros: improved shift pattern

Vehicle: Volkswagen Passat

NGK › Spark plug

socalracingaddict 13 Oct 2025, 20:20

Rating 4.0

OEM plugs are NGK as well.

Pros: OEM quality

Vehicle: Mazda

NGK › Spark plug

hostofthemost 13 Oct 2025, 18:21

Rating 2.0

Idle:
Acceleration:

It has 90k miles and we've been having issues with spark plugs. 3 months ago we replaced them after a cylinder 2 misfire. About a month ago same thing. Both times they looked terrible. Diode was all corroded and the threads had oil on them. Last night on my way to work cylinder 2 misfire came back. Anyway, I always use iridium ngk plugs as thats what's recommended but they are getting expensive having to buy them every month or 2.

Cons: terrible condition, corroded diode, oil on threads, frequent replacement, expensive

Vehicle: Hyundai Sonata

Mileage: 90000 km

NGK › Spark plug

-BitchinChicken- 13 Oct 2025, 15:07

Rating 4.0

Acceleration:

I changed my plugs recently and qent with NGK Ruthenium gaped a step colder and they are working well for me, seem better than Motorcraft but thats just my opinion.

Pros: working well, better than Motorcraft