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ACDelco GM Original Equipment 41-121 Iridium Spark Plug

4.8 4.8 out of 5 stars 690 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Automotive Replacement Spark Plugs by ACDelco

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Purchase options and add-ons

Brand ACDelco
Core Material Iridium
Top Material Type Nickel
Vehicle Service Type Motorcycle

About this item

  • Iridium offers excellent engine idle stability and smooth performance
  • Iridium allows for small, efficient electrode designs for reliable cold starting and quick acceleration
  • Iridium fine-wire electrode helps burn away carbon deposits on the tip of the plug as they form
  • One piece suppressor seal helps block radio frequencies that can affect vehicle electronics
  • Suppressor seal meters spark energy for long electrode life and helps prevent combustion leakage
See more product details

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ACDelco GM Original Equipment 41-121 Iridium Spark Plug
ACDelco GM Original Equipment 41-121 Iridium Spark Plug
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Price$11.99$6.18$8.25$9.99$18.99$37.76
Delivery
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Customer Ratings
Mileage
4.7
4.5
4.1
4.8
Value for money
4.6
4.6
3.8
4.8
Longevity
4.7
4.5
4.1
Sold By
Amazon.com
Amazon.com
Amazon.com
Amazon.com
PremiumpartsWhosale
Sixity Auto
compatible vehicles
Motorcycle
Car
Car
number of items
1
1
4
1
core material
Iridium
Iridium
Iridium
Iridium
Iridium
Platinum

From the manufacturer

ACDelco Spark Plugs
Iridium Spark Plugs

Iridium Spark Plugs

Iridium Spark Plugs are engineered to offer excellent engine idling stability and a smooth performance.

  • Iridium offers excellent engine idle stability and smooth performance
  • One-piece suppressor seal blocks radio frequencies that can affect vehicle electronics
  • Suppressor seal meters spark energy for long electrode life and seal against combustion leakage

Platinum Spark Plugs

Platinum Spark Plugs

Platinum spark plugs are designed to deliver long-lasting performance and maximize durability.

  • One-piece, fired-in suppressor seal blends three glass types for a gas-tight seal
  • Helps reduce radio frequency and engine interference, regulate spark plug energy and seal against compression pressures for long life
  • Double platinum point pad on center and ground electrode offers durability and consistent voltage demands to help reduce wear on ignition system
  • Pure copper core results in cooler electrode temperature for durability and superior fouling resistance

RAPIDFIRE Spark Plugs

RAPIDFIRE Spark Plugs

RAPIDFIRE spark plugs are made with ribless insulators to help optimize plug-to-boot seal.

  • Solid-state suppressor with two-piece glass and brass seal
  • Helps reduce radio frequency interference, regulate spark energy for long electrode life and protect against high combustion pressures
  • Pure copper core provides great heat transfer and helps maximize plug durability
  • Platinum on center electrode enables superior spark characteristics and helps reduce voltage requirements of the ignition system
  • Ribless insulator provides a great plug to boot seal

Conventional Spark Plugs

Conventional Spark Plugs

Designed with a high-quality copper core, these spark plugs help deliver reliable performance.

  • Black onyx coating helps prevent corrosion
  • Copper core provides great heat transfer and helps maximize plug durability
  • Ribbed suppressor seal extends resistance and helps prevent spark “flash over” and misfires
  • Nickel-chrome alloy sheathing helps prevent corrosion on center electrode
  • Available for use in marine applications

ACDelco Spark Plug Infographic
At GM Genuine Parts and ACDelco, we strive to blend quality and expertise to keep you moving forward

Product Description

ACDelco Professional Iridium Spark Plugs are a high quality replacement for many vehicles on the road today. They are our latest in spark plug technology and an exact replacement for your vehicle’s original components. Iridium composition provides a high melting point and great strength, and provides excellent wear resistance and durability. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function.

Product information

Technical Details

Additional Information

Warranty & Support

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ACDelco GM Original Equipment 41-121 Iridium Spark Plug


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    Customer reviews

    4.8 out of 5 stars
    4.8 out of 5
    690 global ratings

    Customers say

    Customers like the quality, value, performance, fit and gap of the spark plugs. For example, they mention they're very good plugs, they save a couple of bucks and that they work great. They say the plugs go in perfectly and that the gap was set perfect.

    AI-generated from the text of customer reviews

    26 customers mention26 positive0 negative

    Customers are satisfied with the performance of the spark plug. They mention that it works great, their car runs well, and has had no problems for 7 months. They also say that it makes a noticeable improvement in engine operations and is efficient. Some customers also mention that the plugs make their Cruze purr again.

    "...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...." Read more

    "Worked great , no issues. Should be good for another 75 - 100k miles" Read more

    "good quality. efficent" Read more

    "...Installed these in my car and it worked like a charm. No problems or nothing." Read more

    13 customers mention13 positive0 negative

    Customers are satisfied with the quality of the spark plugs. They mention that they work well, are reliable, and are a great product.

    "These plugs are great . Picture is of old one at 63000 miles.I always buy ac delco plugs never let me down." Read more

    "These are very good plugs, I replaced them on my turbo engine at 60K miles. They looked so good they probably would have lasted to 100k miles." Read more

    "good quality. efficent" Read more

    "Awesome spark plugs. Great value as well." Read more

    12 customers mention12 positive0 negative

    Customers appreciate the value of the spark plugs. They say it's easy to install and a great price for the sparkplugs. Customers also mention that the shipping was fast.

    "...Found a YouTube video on how to install and I was good to go. Saved a couple of bucks!" Read more

    "...So far so good and definitely worth the price I paid." Read more

    "AC Delco is always a good choice. Great price for the spark plugs and shipping was fast as well...." Read more

    "These are by far the best for GM vehicles. And this price is unbeatable as well. They're all I use in our 2014 Cruze RS...." Read more

    10 customers mention10 positive0 negative

    Customers are satisfied with the fit of the spark plug. They mention that it fits perfectly, has a torque spec of 18 ft lb, and is easy to install.

    "...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...." Read more

    "Fit perfectly for my 2015 Buick Encore! Really made a noticeable improvement in engine operations with these new plugs!" Read more

    "I was completely satisfied with my order. The parts fit perfectly and my car runs much smoother!" Read more

    "...So far my 1998 Honda Accord is driving well. They fit perfectly and came pregapped." Read more

    4 customers mention4 positive0 negative

    Customers are satisfied with the gap of the spark plug. They mention that it was pre-gapped correctly and easy to install on their 2014 Cruze engine.

    "...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...." Read more

    "Gap was set perfect…shipping was fast" Read more

    "I installed these in a 2011 Chevy Cruze Eco. They were correctly gapped from the factory for my application...." Read more

    "They came gapped correctly and easy to install on my 2014 Cruze." Read more

    Quality
    5 Stars
    Quality
    These plugs are great . Picture is of old one at 63000 miles.I always buy ac delco plugs never let me down.
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    Top reviews from the United States

    Reviewed in the United States on July 8, 2019
    9 people found this helpful
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    Reviewed in the United States on March 17, 2024
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    Reviewed in the United States on June 16, 2019
    Reviewed in the United States on January 23, 2023
    Customer image
    5.0 out of 5 stars Quality
    Reviewed in the United States on January 23, 2023
    These plugs are great . Picture is of old one at 63000 miles.

    I always buy ac delco plugs never let me down.
    Images in this review
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    Reviewed in the United States on April 9, 2022
    Reviewed in the United States on March 18, 2023

    Top reviews from other countries

    Translate all reviews to English
    DANIEL COROADO
    5.0 out of 5 stars OEM AC Delco parts shipped to my door FAST
    Reviewed in Canada on October 3, 2021
    denis
    5.0 out of 5 stars conforme
    Reviewed in Canada on March 1, 2020
    Jason
    5.0 out of 5 stars Perfect fit!
    Reviewed in Canada on July 25, 2019
    Rob W.
    5.0 out of 5 stars Thank you
    Reviewed in Canada on December 4, 2019
    tania egas
    5.0 out of 5 stars BOn!
    Reviewed in Canada on November 7, 2019