Denso(5339) ITV20 Iridium Power Spark Plug, (Pack of 1)

Item has described, excellent product

None

I bought a used 2012 Mazdaspeed3 and put these in as preventive maintenance at 60k miles in case the old plugs were originals with 60k on them. The old ones didn't look bad at all and probably had less than 30k miles on them even though they were OEM plugs, which I believe are NGKs rebranded as FoMoCo. I can tell no difference in performance or fuel economy since I changed them, which is exactly what I would expect. These were precisely gapped to what they said on the box, but I needed to re-gap to 0.024 - 0.028" which took a bit of muscle. I'll likely buy these again in another 60k miles.

Work good

I'm not sure you can "love" a spark plug, but these were fine OE replacements in my mazdaspeed3. They came shipped loose in the box, but mine had plastic sleeves to maintain the gaping. I did confirm the gap was correct on all 4 with my feeler gauge before installing.Upon replacement, the car started right up and isn't showing any signs of having issues. This is the first time I'm using a Denso plug, normally I buy NGK, but the price was better on these so I'm glad the quality seems to be there also.

Runs smooth. Steady firing.

Replacing the OEM Iridium spark plugs resulted in a smoother acceleration across the entire RPM range. These spark plugs combined with 91 octane gas (recommended is 87) resulted in better engine performance which is important if you own a Ford Fiesta with the 6-speed dual clutch automatic transmission. Transmission performance improved at lower engine RPM and was smoother at mid and high RPM.

Very fast delivery nice product

Although pricey fixed the problem of a slight hesitation on 2011 Terrain when stepping hard on the gas pedal. Has improved power with a slight increase in gas mileage on highway

吹け上がりがよくなった！途中で引っかかる様な感じだったがすごく軽い感に良く回る様になった！と思う。。。

走行が３００００kmを超えたのでなんとなく交換しましたが、気になっていた低速時のノッキングが消えて加速がとてもよくなりました。体感できます。