Chevron heavy-duty engine oil engineered to deliver industry-leading durability, reliability, and efficiency developed to work in synergy with the changing conditions of diesel engines.
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.
Delo 600 ADF Synblend
- Extends DPF cleaning intervals by 2.5 times
- Extended drain and oil change interval potential of up to 1.7 times*
- Fuel economy improvement potential of up to 4.2%**
- Developed for use in all diesel engines
Delo 400 XSP Synthetic
- Improves valve train and piston ring wear protection
- Extends drain and oil change interval potential up to 2 times*
- Fuel economy improvement potential of up to 1.6%**
- For use in diesel and gasoline engines
Delo 400 XLE Synblend
- Increases scuffing resistance and protection against light-duty power cylinder failure by reducing low-speed pre-ignition (LSPI)
- Extends drain and oil change interval up to 1.5 times*
- Fuel economy improvement potential of up to 1.2%**
- For use in diesel and gasoline engines
Delo 400 XLE SB Synblend
- Extends drain and oil change interval up to 1.5 times
- Improves engine life and cleanliness
- Exceptional deposit control
- Long drain performance
*Extended oil drain interval (ODI) potential is based on the average of US Class 8 engine manufacturers’ recommendations. Results will vary depending upon vehicle/equipment type, fuel consumption, maintenance practices, temperature, and variable driving/operating conditions. Consult the engine/vehicle OEM and Chevron before implementing extended ODIs, especially if the engine/vehicle is under warranty.
**Improvement vs. SAE 15W-40 oil in class 8 diesel engine bench testing. Actual savings will vary depending upon vehicle/equipment type, load, temperature, and variable driving/operating conditions.