If you're searching for a 2021 GMC Yukon XL SLT for sale in Detroit, MI, this is the full-size SUV that checks every box — commanding presence, genuine capability, and a refined interior that makes every mile feel intentional. Available now at Best of Michigan Auto Sales, this four-wheel-drive Yukon XL is ready to work as hard as it plays, whether you're navigating Detroit's city streets or heading out to northern Michigan for the weekend.

At 125,895 miles, this 2021 Yukon XL has been on the road, but that's not a red flag — it's a testament to how well-built these trucks are. The ECOTEC3 5.3L V8 platform is one of GM's most proven powertrains, and Yukon XL buyers regularly report these engines running strong well past 200,000 miles with proper maintenance. For the value-conscious Detroit-area buyer, this represents a significant opportunity to own a premium, large-format SUV at a fraction of its original MSRP.

About This 2021 GMC Yukon XL SLT

The 2021 model year was a landmark for the Yukon XL — GMC fully redesigned the platform, introducing independent rear suspension for the first time, dramatically improving ride quality and third-row comfort. This isn't the old, truck-stiff Yukon. It rides, corners, and absorbs bumps in a way that genuinely surprised automotive critics when it launched. The SLT trim sits confidently in the middle of the lineup, offering most of the luxury content without the full Denali premium.

Four-wheel drive gives this vehicle real-world versatility. Michigan winters are no joke, and knowing you have 4WD available when Lake Erie-effect snow rolls into the metro area is genuine peace of mind.

2021 GMC Yukon XL Performance and Engine

5.3L ECOTEC3 V8 — Power You Can Feel

The 5.3L ECOTEC3 V8 produces 355 horsepower and 383 lb-ft of torque in the 2021 Yukon XL, numbers that translate into confident passing power, strong highway merging, and a maximum tow rating of up to 8,000 pounds depending on configuration. This engine uses Dynamic Fuel Management, which can deactivate cylinders under light loads to improve fuel economy — a real-world benefit on long Michigan highway runs.
 

10-Speed Automatic Transmission

Paired with a 10-speed automatic transmission with overdrive, this drivetrain keeps the engine in its optimal power band across a wide range of driving conditions. Gear changes are smooth and nearly imperceptible during normal driving, while the wide ratio spread ensures the V8 never feels breathless at highway speeds. This combination is significantly more refined than previous-generation Yukon XL models.

GMC Yukon XL SLT Features and Interior

What the SLT Trim Delivers

The SLT is where the Yukon XL starts to feel like a true luxury SUV. Standard features at this trim level include a 10.2-inch infotainment touchscreen with wireless Apple CarPlay and Android Auto, a premium Bose audio system, leather-appointed seating, heated front seats, power-adjustable front seats, and a power panoramic sunroof. The three-row interior comfortably seats eight, and the independent rear suspension redesign opened up significantly more third-row headroom and legroom compared to older body-on-frame configurations.

Technology and safety features typically found on the 2021 Yukon XL SLT include forward collision alert, automatic emergency braking, lane keep assist, rear cross-traffic alert, and a surround-view camera system — features that make daily driving in heavy Detroit metro traffic noticeably more relaxed.

GMC Yukon XL Reliability and Ownership

The ECOTEC3 5.3L V8 has one of the best long-term reliability records in the full-size SUV segment. Owners consistently praise the engine's durability, and GM's 10-speed transmission, while a newer unit than older 6-speeds, has accumulated a solid service record in the years since its introduction. The 2021 redesign also addressed long-standing complaints about the previous generation, particularly around rear passenger comfort and cargo flexibility.

Common maintenance items to keep up with on high-mileage Yukon XLs include transmission fluid service, differential fluid changes, spark plug inspection, and monitoring the AFM/DFM lifter system — a known consideration on higher-mileage 5.3L engines. Many owners opt for a simple AFM disabler device as a preventive measure. Overall, the Yukon XL has a strong reputation for going the distance with regular care.

Why Buy From Best of Michigan Auto Sales in Detroit, MI

Best of Michigan Auto Sales has been serving Detroit-area buyers with quality pre-owned vehicles and a no-pressure buying experience. Located right here in Detroit, the team understands what Michigan drivers need — capable vehicles that handle real winters, real commutes, and real family demands. When you shop local, you're working with people who know this market, know these roads, and are invested in your satisfaction long after the deal is done.

Whether you're coming from the east side, the west side, or the suburbs, Best of Michigan Auto Sales makes the process straightforward. Reach out directly at 313-499-8335 to ask questions, schedule a test drive, or discuss your trade-in.

Financing a Used GMC Yukon XL Near Detroit

Buying a used Yukon XL doesn't have to be complicated. Best of Michigan Auto Sales works with a range of lenders to help buyers across the credit spectrum get into the vehicle they want. Whether you have excellent credit, are rebuilding, or are somewhere in between, there are financing paths worth exploring.

Detroit-area buyers from Dearborn, Warren, Southfield, and beyond regularly work with the team here to structure payments that fit their real budgets. Bring your trade, bring your pre-approval, or start from scratch — the finance team will work with what you've got.

Frequently Asked Questions

Is the 2021 GMC Yukon XL a good buy?

Yes — the 2021 model year represents the first year of a major redesign that dramatically improved ride quality, interior space, and technology. Buying a 2021 means you're getting the new-generation platform, not the older body-on-frame setup with a solid rear axle. It's widely considered one of the best full-size SUVs available in the used market right now.
 

How many miles is too many for a 2021 GMC Yukon XL?

The ECOTEC3 5.3L V8 is built for longevity. With proper maintenance history, 125,000 miles on a Yukon XL is very manageable — these engines routinely reach 200,000 to 250,000 miles. The key is reviewing service records and ensuring fluid changes have been performed on schedule.
 

What does the SLT trim include on the 2021 Yukon XL?

The SLT trim adds significant luxury and technology content over the base SLE, including leather seating, a larger infotainment display, premium audio, heated seats, power-adjustable front seats, and a panoramic sunroof. It also includes a more complete suite of driver assistance and safety technologies.
 

Is the 2021 GMC Yukon XL good in snow?

With 4WD, absolutely. Michigan winters are well within this vehicle's capabilities. The four-wheel-drive system provides strong traction in snow and ice, and the Yukon XL's size and weight give it stable, planted behavior in adverse conditions. Pairing it with proper winter tires takes performance to another level.
 

What is the towing capacity of the 2021 GMC Yukon XL 5.3L?

The 2021 Yukon XL with the 5.3L V8 is rated to tow up to approximately 8,000 pounds when properly equipped. This makes it suitable for towing boats, campers, trailers, and recreational equipment — a major selling point for Michigan buyers who spend time Up North.

Serving Detroit and Surrounding Areas

Best of Michigan Auto Sales is proud to serve buyers from across Southeast Michigan and Metro Detroit. Whether you're coming in from Dearborn, Livonia, Warren, Sterling Heights, Southfield, Pontiac, Ann Arbor, or Taylor, we're centrally located and easy to reach.

Buyers from the Grosse Pointe communities, Macomb County, and Oakland County regularly make the trip to Detroit for our inventory — and they leave satisfied. If you're anywhere in the greater Detroit metro area and searching for a used GMC Yukon XL, this vehicle deserves a close look in person.

Contact Best of Michigan Auto Sales Today

This 2021 GMC Yukon XL SLT 4WD won't sit long. Full-size SUVs with this trim level and drivetrain combination move quickly in the Detroit market, especially heading into the colder months. Call Best of Michigan Auto Sales today at 313-499-8335 to confirm availability, ask about the vehicle history, and schedule your test drive.

Stop by the lot at 16850 in Detroit, MI, see this Yukon XL in person, and experience what it feels like behind the wheel of one of GM's finest full-size SUVs. The team is ready to help you drive home in confidence.