vs
Spark plug Denso or OEM Mazda
Denso or NGK. Buy them from a real vendor not eBay or Amazon or anything like that
Replace with OEM - Denso. And yeah, get them from rock auto. Anywhere else is way too expensive and eBay is most likely counterfeit garbage.
Cons: expensive elsewhere
OEM are actually cheaper than a lot of aftermarket plugs. Buy from a place like bell Lexus or just get the denso branded equivalent. They last hundreds of thousands of miles in some cases, so OE has certainly proved its worth
Pros: last hundreds of thousands miles
Cons: cheaper aftermarket plugs
Vehicle:
Lexus
Denso 3297 on Rockauto are the Oem plugs
Part number: 3297
There is no risk, EQT specifically recommends them. Been running denso 5749s for over 40k miles and change them every 10k. Send it.
Pros: EQT specifically recommends
Vehicle:
Volkswagen
Mileage: 40000 km
Part number: 5749S
Ive been running eBay denso plugs for 4 plug changes. You need to read reviews and look at the packaging to make sure they're not counterfeit. They've lasted me and performed exactly as they should.
Pros: lasted and performed
Vehicle:
Toyota
I have a 2012 Civic LX (purchased new) and replaced the original spark plugs at 100k miles with **Denso 3483 (DXU22HCR-D11S)**—which were listed as compatible on RockAuto at the time. I’ve had great results and am now at 200k miles, looking to replace them with the same.
Pros: great results
So i just ordered a pack of 4s (the left one is from Denso Japan) from a local distributor carrying Denso spark plugs and of the 4, 3 are made in China and 1 is made in Japan. Comparing them side by side, the China ones definitely look subpar to the naked eye.
Cons: subpar to the naked eye
Had some Denso plugs in my '15 WRX (unaware to me) and the plug in cylinder 2 was fouled within 7k miles and caused a misfire. Turns out the shop that the previous owner took it to for the 60k-mile plug change decided to cheap out. I now have OEM plugs :D
Pros: now have OEM plugs
Cons: fouled within 7k miles
Vehicle:
Subaru
Mileage: 7000 km
Careful with Denso, back in MK7 days some complained that the plugs would shatter and cause engine damage.
Cons: plugs would shatter
Vehicle:
Volkswagen Golf
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