Product ReviewsNGK 6637 Spark Plug

The Best Spark Plugs

NGK have always made excellent quality spark plugs. I only fitted NGK to all makes and models over 20 years as a mobile mechanic. Never had one fail which says it all.
I'm fitting these iridium tipped ones as they will not need to be replaced for at least 40,000 miles. Fit and forget.
Definitely recommended.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: spanners_stuff

Car Performance

This is a terrific product and I strongly recommend these plugs to anyone
I recently had to fit a new distributor cap and rotor arm to my 1989 Porsche 944 Lux I didn't notice any difference in performance till I installed these Iridium Spark Plugs and the difference was noticed right away
So I recommend them whole heartedly
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Verified purchase:  Yes | Condition: new | Sold by: powersparks

plugs

IRIDIUM PLUGS, I have used before, it is the only plug to use on an old bike, starts first time every time, on 1960 bonnie and 1962 gold star, it makes them go

Verified purchase:  Yes | Condition: new | Sold by: spanners_stuff

Great Product

One of the best spark plugs available.

Verified purchase:  Yes | Condition: new | Sold by: timgreen880

Well worth the money

Cleared a fouling problem I had with my Lancia 2c Berlina.

Verified purchase:  Yes | Condition: new | Sold by: carpartssaver

Worth using as they last longer . At good price

Verified purchase:  Yes | Condition: new | Sold by: the_stop_shop_uk

Worth the money

Immediate improvement in starting and smoother running

Verified purchase:  Yes | Condition: new | Sold by: diycarserviceparts

works well

as described

Verified purchase:  Yes | Condition: new | Sold by: car_parts_inter...

very good

as usual NGK plugs is to be relied upon

Verified purchase:  Yes | Condition: new | Sold by: the_stop_shop_uk

NGK

Good quality and reliable

Verified purchase:  Yes | Condition: new | Sold by: 123_autocare