3L Duramax Diesel vs. 5.3L Ecotec V8

2021 Chevy Silverado 1500 LTZ
3.L Duramax Diesel


5.3L Ecotec V8 engine (L84)
Available on LT, RST, LTZ, and High Country

Standard On

LT Trail Boss, LTZ, and High Country; available on LT and RST
277 hp


355 hp
460 lb-ft


388 lb-ft
10-Speed Automatic


8-Speed Automatic
23/33 MPG

Fuel Economy (City/Highway MPG)

15/21 MPG
9,500 pounds


11,500 pounds

Auto Stop/Start Technology


Are you interested in upgrading your pickup truck with a new 2021 Chevrolet Silverado? You have an idea of what Silverado trim level you want to get, but you’re not sure if the 3.L Duramax Diesel or 5.3l Ecotec V8 engine is better suited for your Mobile, Al-area jobsites. The Chevrolet Silverado LTZ trim is the first model where the 5.3L comes standard and the 3.L Duramax is available. Don’t hesitate to reach out to us if you have any questions, or take the next steps and get pre-approved for financing right at home. It’s time to find the new Chevrolet Silverado for sale that’s best suited for you with the team at U-J Chevrolet!

3L Duramax Diesel or 5.3L Ecotec: Performance Specs

When you have the option of choosing what’s under the hood of your pickup truck, you want to make sure you’re getting the engine that can handle your tough jobsites and everyday needs with ease. Let’s compare their performance below:

3L Duramax Diesel 

  • Horsepower: 277 hp
  • Torque: 460 lb-ft
  • Transmission: 10-Speed Automatic
  • Fuel Economy: 23 MPG City/33 MPG Highway
  • Towing: 9,500 pounds

5.3L Ecotec

  • Horsepower:
  • Torque: 388 lb-ft
  • Transmission: 8-Speed Automatic
  • Fuel Economy: 15 MPG City/21 MPG Highway
  • Towing: 11,500 pounds

Both engines are quite powerful and are worth having under the hood of your Silverado pickup truck. It’ll come down to which features are more important to you.

2021 Silverado Towing Features

The powerful Silverado knows how to make heads turn on the Biloxi, MS, and it’s as capable as you would expect a Chevrolet pickup truck to be. With the 3.L Duramax Diesel engine, you’re getting an EPA-estimated fuel economy of 23 mpg city and 33 mpg highway ratings, which means you can take the scenic route and enjoy the ride without worrying about the nearest gas station. Both offer incredible towing capabilities, but the diesel engine can’t compete with the Ecotec engine. 

Let’s take a look at the towing feature you’ll in the new Chevrolet Silverado for sale at U-J Chevrolet:

  • Standard Silverado 1500 Trailering Package: 7-wire electrical harness and 7-pin sealed connector, Trailer Hitch, Trailering hitch platform, 2-inch receiver hitch, 4-pin, and 7-pin connectors, and Hitch Guidance.
  • Available 6-Speed Automatic Transmission: The six-speed automatic transmission is electronically controlled with overdrive with Tow/Haul mode, high upshift points, and raised downshift points.
  • Available Custom Convenience Package: Remote Start, content theft alarm, rear-window defogger, LED cargo bed lighting, EZ Lift, power lock, and a release tailgate are available under this package.
  • Available Max Trailering Package: Revised shock tuning, upgraded rear springs, Handling/Trailering Suspension Package, and more are available with this package.

Compare the Duramax Diesel vs 5.3L Ecotec Today!

When you’re ready to upgrade your Biloxi, MS commute, we’re standing by to make sure you end behind the driver’s seat of the Silverado that’s best suited for you. Between our competitive prices and new vehicle specials, you’re in excellent hands with the team at U-J Chevrolet! Give us a call if you have any questions!


Contact Us

Contact Us

Contact Us

U-J Chevrolet 30.6846, -88.2204.