From a quick spark plug or filter swap to getting the most out of your engine and beyond, GM Genuine Parts and ACDelco are the true Original Equipment for GM vehicles. Our three-tiered roster also includes aftermarket parts for most other makes and models. So, whatever you drive and whatever your next DIY project is, O’Reilly has the GM Genuine Parts and ACDelco parts you need — the only parts backed by GM.
20% OFF $125+ WITH PROMO CODE: GREEN20, Online Only
Get 20% off $125 with promo code GREEN20. Online, ship to home only. 04/23/26 – 04/27/26. *Maximum discount $50.
20% off $125+: Valid on regularly priced in-stock items for Ship to Home orders that when purchased together total $125 or more (before tax, shipping and discount) on the website only. Excludes AIRAID, B&M, Bully Dog, DeVilbiss, Edelbrock, Flowmaster, Holley, Hurst, Ingersoll-Rand, K&N, MSD, SCT, and Spectre items.
To Redeem Offer: Add qualifying items totaling $125 or more to your shopping cart and select “Ship” as your delivery method. Enter promo code GREEN20 in the cart. The total in your shopping cart will be adjusted after promo code is applied. Excluded brands contribute toward minimum purchase amount to qualify for offer but are not eligible for discount. (Maximum $50.00 Discount.) Valid Thursday, April 23rd to Monday, April 27th, 2026 (11:59pm Hawaii Time Zone). Coupon code is not redeemable for cash, is nontransferable and cannot be replaced if lost or stolen. Not valid on same-day delivery orders. Void if copied, transferred or where prohibited by law. Customer pays sales tax and shipping fees.
Offer subject to adjustment due to returns, cancellations and exchanges. Additional taxes and duties may apply. Not valid with any other promotional gift with purchase. Offer may be modified or discontinued at any time without notice.
Offer Terms: Offer does not apply to gift card orders. Offer does not apply to Lead-Acid batteries. Cannot be used in combination with any other certificates, offers, or discounts or for payment on account. Not valid on previous purchases or store purchases. Shipping & handling and taxes do not qualify towards the minimum purchase. Valid for retail customers only. OReillyAuto.com only ships orders within the U.S.
Excluded Brands: Offer does not apply to AIRAID, B&M, Bully Dog, DeVilbiss, Edelbrock, Flowmaster, Holley, Hurst, Ingersoll-Rand, K&N, MSD, SCT, and Spectre items.
Spark Plugs
Spark new life into your vehicle, boat, RV, ATV, or outdoor power equipment with a fresh set of GM Genuine Parts or ACDelco Spark Plugs or Glow Plugs.
Oil, Fuel, and Air Filters
Ride in comfort and road trip in confidence with ACDelco GM OE and aftermarket filters.
Engine Management
Help keep your engine firing on all cylinders with alternators, starters, throttle bodies, sensors, and more.
Streamlined Packaging, Streamlined Shopping
We've updated our packaging to highlight our three-tiered roster of maintenance and repair parts to help you find the best fit for your vehicle. Making the choice between OE and aftermarket parts for all your DIY projects simpler.
Doing DIY Together
Contrary to popular belief, you don’t have to DIY alone. You can lean on your local O’Reilly store for all the GM Genuine Parts and ACDelco parts your vehicle needs. Whether you prefer to pop in or order online, O’Reilly is stocked with OE parts for your GM and the only aftermarket parts backed by GM for many other makes and models.
GM Original Equipment
The blue flag that marks our GM Genuine Parts and ACDelco Original Equipment does more than help you find the right parts for your project — it's a mark of confidence. A mark that lets you know you're using parts designed, engineered, and tested to rigorous standards and backed by General Motors.
