7751 are the OEM plugs and rated for ~105k miles, give or take.
Pros: OEM plugs, high mileage rating
Mileage: 168981 km
Part number: 7751
Owner reviews for spark plug
Manufacturers
Comparisons
I have only used Bosch plugs in my cars, and I have not had any issues with them yet.
Pros: no issues yet
I like my NGKs a lot. Never had any issues with them and they perform well
Pros: perform well, no issues
Honestly I think NGK plugs are better. Either one does the same thing, but I've never heard of a bad NGK plug, even well beyond its normal useful life.
Pros: better, never heard bad
Changing my sparkplugs for the first time (32k miles, yes it's early but I got a great deal on the plugs) and found that the stock plug in cylinder 4 actually had a ground electrode defect and was significantly thicker than normal. The car runs stronger than it ever has as this was likely causing extra timing pull.
Pros: car runs stronger
Cons: ground electrode defect
Vehicle:
Subaru
Mileage: 51500 km
Bosch iridiums, these for longevity, copper ones have better spark if your concern is performance
Pros: longevity, better spark
I stick with ngk iridium
Pros: ngk iridium
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
Those spark plugs are junk, and on top of that, they are now carbon fouled. I would strongly encourage you to install new, normal, spark plugs.
Cons: spark plugs are junk
Vehicle:
Volkswagen
I’ve kept to stock plugs with stage 1. I tried the recommended “colder” plugs and they failed in less than 10k miles.
Cons: failed in less than 10k
Mileage: 10000 km
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