Spark plug NGK or AC DELCO

NGK Spark plug

I ordered NGK plugs gapped to factory spec (.032). I didn't pre-check them, but I late went back and checked them and they were all in spec.

Pros: factory spec
Mileage: 65000 km
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NGK Spark plug
BigUpstairs6349
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Rating 5.0

replace the plugs with NGK only... I did this on 21 cars and every time the car started working as a new one. All cars were Audi of course.

Pros: car worked like new
Vehicle: Audi
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NGK Spark plug

I would go for NGK. Using this brand on all my cars so far, I would not risk a switch. Although a compatible Denso will be equal for the short/mid/term.

Pros: good brand, reliable choice
Cons: risk of switching brands
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NGK Spark plug
ittimjones
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Rating 3.0

I have the ruthenium. Bought pregapped from Mountune. They are fine. They work no noticable change. I've put about 200k miles on them between by ST and RS and changed every 50k miles with no issues (both tuned and stock).

Pros: no issues, long lifespan
Cons: no noticeable change
Mileage: 50000 km
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NGK Spark plug

Also dont use plugs for tuned cars if youre not tuned. Tuned cars run colder plugs. They are not the same dont listen to some of these comments lol

Cons: colder plugs, not same
Vehicle: Infiniti Q50
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