The 2020 GMC Sierra 3500HD Denali in Quicksilver Metallic with Jet Black interior delivers heavy-duty Duramax diesel power, premium Denali refinement, and 4WD capability for drivers who want serious truck strength without giving up first-class comfort. Powered by a Duramax 6.6L V8 Turbodiesel engine and paired with a 10-speed automatic transmission, this Sierra 3500HD Denali brings massive torque, confident towing performance, and smooth power delivery in a truck built to handle real work while still looking every bit the high-end pickup it is. With 127,673 miles, this Denali still offers strong value, upscale presence, and the kind of broad heavy-duty appeal that keeps a well-equipped diesel truck in demand.

Entertainment and Connectivity Features
• Large touchscreen infotainment display
• Apple CarPlay integration
• Android Auto integration
• Bluetooth® hands-free connectivity
• Built-in navigation capability
• Premium audio system
• Wireless phone charging
• USB charging and media ports
• Steering wheel mounted audio and phone controls
• Voice recognition capability

Added Features
• Denali premium trim package
• Quicksilver Metallic exterior
• Jet Black interior
• 4WD capability
• Duramax 6.6L V8 Turbodiesel performance
• Crew Cab configuration
• Premium leather-appointed seating
• Heated and ventilated front seats
• Power-adjustable front seats with memory settings
• Chrome Denali-specific exterior accents
• Strong towing and hauling appeal
• Bold heavy-duty luxury truck presence

Safety Features
• Forward Collision Alert
• Automatic Emergency Braking capability
• Lane Departure Warning capability
• Following Distance Indicator
• HD rear vision camera
• Front and rear park assist
• Electronic Stability Control
• Anti-lock braking system
• Advanced airbag system
• Trailer sway control

Standard Features
• LED headlamps and LED daytime running lights
• Premium alloy wheels
• Dual-zone automatic climate control
• Power windows and door locks
• Remote start capability
• Push-button start
• Spacious Crew Cab interior
• Rear seat air vents
• Power-folding side mirrors
• Premium interior trim and accents

Mechanical Features
• Duramax 6.6L V8 Turbodiesel engine
• 10-speed automatic transmission
• Four-wheel drive
• Heavy-duty suspension system
• Four-wheel disc brakes
• Electric power steering
• Integrated towing capability
• Strong diesel torque for towing and hauling
• Built for heavy-duty work, travel, and demanding use
• Smooth long-haul diesel performance

Why drivers choose Port Lavaca Auto Group for their next vehicle

• Trusted dealership serving Texas drivers with transparent, pressure-free buying experiences
• Large selection of quality SUVs, trucks, and cars ready for immediate delivery
• Knowledgeable product specialists who help match drivers with the right vehicle
• Flexible financing options for a wide range of buyers
• Ongoing customer support and service after the sale
• Strong reputation backed by consistent five-star Google reviews

Customer Review Highlight

We shopped around quite a bit before buying, and Port Lavaca Auto Group stood out right away. They were professional, easy to talk to, and made sure everything was clear from start to finish.
Heather W., March 2026

From its proven Duramax diesel power and 4WD capability to its premium Denali trim and upscale Crew Cab comfort, the 2020 GMC Sierra 3500HD Denali is built for drivers who want heavy-duty truck capability, refined luxury, and the confidence to tow, haul, and travel without compromise.