Mine are either ACDelco or NGK, cant remember which. Either way no complaints.
Pros: no complaints
Vehicle:
Chevrolet
Reviews of NGK spark plug
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I went ahead and replaced all 4 coil packs and plugs as well as the PCV valve. Since I have to order parts, it seemed faster than checking the plugs and swapping coil packs, as well as good insurance, since the coil packs and PCV valve were (over)due for replacement anyway. It took about an hour without rushing. Took about a 30-minute test drive, highway and town, and the engine's running smoothly. Ran a scan when I got home, and no new fault codes, so I cleared them all out and the check engine light went out.
Pros: engine running smoothly
Vehicle:
Volkswagen Passat
The only thing I noticed when it was extremely hot and humid my car was slow in accelerating.
Cons: slow in accelerating
Mileage: 93000 km
I have always used double plat or ngk laser iridium with no issues in my 2.5.
Pros: no issues
I've used Autolite plugs in my stock 2011 for 6 years. I wanted to try NGK's so I recently installed a set of Ruthenium NGK plugs. I haven't noticed any difference between the two brands.
Pros: no noticeable difference
Vehicle:
Mazda
I ran stock plugs for a while and they got chewed up fast. On NGks now and even pushing 29 psi they keep the gap well.
Pros: keeps the gap well
Cons: stock plugs chewed up
Vehicle:
Ford Focus
I run the IS38 FBO and beat the crap out of my car and use stock heat-range Rutheniums.
Pros: durable under stress
Vehicle:
Volkswagen Golf
Spark plugs. NGK 4 lyfe
Pros: NGK 4 lyfe
NGK spark plugs are preferred in rotary engine (RE) Mazdas and Nippondenso is the only acceptable substitute that I ever found. We dealership technicians, always found it remarkable how a set of Champion or AC spark plugs could instantly cripple a rotary powered Mazda.
Pros: NGK spark plugs preferred
Cons: Champion/AC spark plugs cripple
Vehicle:
Mazda
My 2017 Jetta SEL with LFER7BHX 9512 plugs starts/runs fine at 50076 miles, 0-100 degrees F.
Pros: starts/runs fine
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