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⚡ Ignite your drive with ACDelco’s pro-grade iridium spark plug — because smooth rides wait for no one!
The ACDelco Professional 41-121 Iridium Spark Plug delivers cutting-edge ignition technology with a fine-wire iridium electrode that enhances engine idle stability, accelerates cold starts, and resists carbon buildup. Its one-piece suppressor seal blocks radio frequency interference, ensuring flawless vehicle electronics performance. Backed by a 7-year unlimited mile warranty, this spark plug is engineered for durability, precision, and seamless OEM fitment across compatible motorcycles and vehicles.
| ASIN | B00DU252BM |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #69,850 in Automotive ( See Top 100 in Automotive ) #501 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 799 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 |
| OEM Equivalent Part Number | 55585517 |
| Part Interchange Info | 41-121 |
| Thread Size | 14mm |
| Top Material Type | Nickel |
| UPC | 707773972090 |
| Unit Count | 1.0 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.
L**S
Great quality
Excellent quality and great price!
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
G**O
The same spark plug from the dealer
The original spark plug for my cruze
A**V
Works fine.
It does what it is designed for. Lasts a long time
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
2 weeks ago
1 week ago