Used 2020 Mercedes-Benz GLS for Sale nearDetroit, MI

How much does the 2020 Mercedes-Benz GLS cost?

Prices have softened 14.62% compared to this time last year, making it a favorable time to shop this model year.

There are 754 listings available, which gives you a solid amount of inventory to compare.

Is the 2020 Mercedes-Benz GLS a good car?

Yes — the 5/5 user rating points to strong owner satisfaction, and the 2020 GLS backs that up with three-row seating, up to 94 cubic feet of cargo space, and a luxury-focused cabin. It is especially appealing if you want a family-friendly SUV that still feels upscale, with a roomy interior and a long list of standard comfort and convenience features. The tradeoff is that it is still a large SUV, so you should expect the usual compromises that come with size and luxury packaging. With 37.8% of listings marked as good or great deals, you have some room to shop selectively.

Is the 2020 Mercedes-Benz GLS reliable?

Owners rate it 5/5, a strong signal of long-term satisfaction.

The 2020 GLS also benefits from a new-generation redesign and a more efficient six-cylinder setup with mild hybrid assistance, which suggests a more modern ownership experience than the prior model year. Its generous standard equipment and added safety features can help reduce day-to-day friction, too. For used buyers, the main long-term risk is that a large luxury SUV can be expensive to maintain if prior care was inconsistent.

What should I look for when buying a used 2020 Mercedes-Benz GLS?

At 74.1% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.

Start with a vehicle history report so you can confirm accident records, title status, and service consistency before you go any further. Then prioritize a pre-purchase inspection, with extra attention to bodywork, alignment, electronics, and signs of uneven wear. Because this is a luxury SUV with a complex feature set, condition matters as much as mileage when you compare listings.

Is now a good time to buy a used 2020 Mercedes-Benz GLS?

This is a moderate market, so you can shop selectively without expecting every listing to be a bargain.

• Deal availability: 37.8% of listings are priced as good or great deals.
• Inventory: There are 754 listings available.
• Price trend: Prices have softened 14.62% compared with last year.
• Clean inventory: 74.1% of listings are accident-free.

If you find a listing below $32,423, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2020 Mercedes-Benz GLS's resale value?

The current average of $32,423 sits slightly below last year's $37,973.

That price drop suggests the market has already adjusted downward, which can help you buy at a more favorable entry point today. For a future seller, that also means resale value may depend heavily on condition, mileage, and how well the vehicle has been maintained. Well-kept examples should stand out more clearly if the broader market stays soft.

Vehicles with strong owner satisfaction ratings, like this model year's 5/5, tend to retain buyer demand, which supports resale value over time.

Should I buy a 2020 Mercedes-Benz GLS or consider a different year?

If you're weighing the 2020 against nearby model years, here's how to think about it:

Choose the 2020 if:

• 37.8% of listings are priced as good or great deals.
• At 74.1% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 14.62% compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.

Consider the 2021 if:

• At $46,775, the 2021 costs more than the current year's $32,423 average.
• It adds a more luxury-first character with multiple powertrain options and a stronger flagship feel.

The bottom line: If you want the better value, the 2020 is the smarter starting point because it combines strong satisfaction, a lower average price, and meaningful inventory. If you are willing to pay more for a newer model with a more upscale positioning, the 2021 is the better secondary path for buyers who prioritize that extra refinement over price.

These recommendations are based on CarGurus' proprietary market data from September 22, 2026, CarGurus experts' opinions, and generative AI.