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⚡ Ignite your ride with precision and power — don’t get left in the dust!
The ACDelco Professional 41-121 Iridium Spark Plug delivers OEM-quality performance with a durable iridium core, fine-wire electrode for efficient combustion, and a suppressor seal that prevents electronic interference. Designed for motorcycles and other vehicles, it ensures smooth idling, quick starts, and long-lasting reliability backed by a 7-year warranty.












| ASIN | B00DU252BM |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #549,690 in Automotive ( See Top 100 in Automotive ) #2,892 in Automotive Replacement Spark Plugs |
| Brand | ACDelco |
| Brand Name | ACDelco |
| Compatible with Vehicle Type | Motorcycle |
| Core Material | Iridium |
| Customer Reviews | 4.8 out of 5 stars 803 Reviews |
| Global Trade Identification Number | 40707773972098 |
| Included Components | Spark Plug |
| Item Type Name | Spark Plug |
| Item Weight | 1.44 ounces |
| Manufacturer | ACDelco |
| Manufacturer Part Number | 55585517 |
| Manufacturer Warranty Description | 7 Year / Unlimited Mile Limited Warranty on parts sold on or after 04/01/18. (Parts Only) Please see ACDelco.com for more details. |
| Model Number | 41-121 |
| Number of Items | 1 |
| Number of Packs | 1 |
| OEM Equivalent Part Number | 55585517 |
| Part Interchange Info | 41-121 |
| Thread Size | 14mm |
| Top Material Type | Nickel |
| UPC | 707773972090 |
| Unit Count | 1 Count |
| Vehicle Service Type | Motorcycle |
A**N
Great product
Great price Came fast Works great in 2015 Cruze
M**D
OEM plugs. Get a torque wrench.
OEM plugs for my 2015 Chevrolet Trax. Came pre-gapped. I verified the gap and they were all correct. Took minutes to install. My vehicle runs much smoother nwo! Word of the wise: use a torque wrench to make sure you don’t over tighten the plugs. You’ll regret it otherwise.
B**E
Genuine OEM spark plugs
Cant go wrong installing OEM ac delco spark plugs. The original plugs lasted 80,000 miles. And I imagine these plugs will do the same.
D**R
OEM Replacement for 2014 Cruze LT 1.4 Turbo
I put around 90,000 miles on my 2014 Cruze "Bought New" and I thought it was about time to replace the plugs. I seen some conflicting information on which plugs to get for this car. The orginal plug was a Delco 41-121 so I opted to stay with the same plugs. These went in perfectly with no issue at all torque spec to 18 ft lb's. They also come pre gap'd for the Cruze engine. Very easy install, just make sure to not over torque and you will be good to go. Car runs like new again.
R**Y
Good
C**N
Buick Encore 2017
Perfect fit my 2017 buick encore 1.4 turbo
A**V
Works fine.
It does what it is designed for. Lasts a long time
L**S
Great quality
Excellent quality and great price!
J**N
Perfect fit!
Exact replacement part that i require for the job.
D**S
conforme
pièces conforme comme original
D**O
OEM AC Delco parts shipped to my door FAST
OEM spark plugs work the best in GM vehicles. They were shipped very quickly at a good price, fit perfectly ,and my car runs like new again.
T**S
BOn!
Bon!
R**.
Thank you
Thank you
Trustpilot
3 weeks ago
2 weeks ago