Used 2020 Mercedes-Benz GLS for Sale nearMilwaukee, WI

How much does the 2020 Mercedes-Benz GLS cost?

Prices have softened 17.08% compared to this time last year, making it a favorable time to shop this model year.

There are 781 listings available, which gives you a meaningful 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 GLS’s appeal is clear if you want a full-size luxury SUV with three rows, generous passenger space, and up to 94 cubic feet of cargo room. The overview also frames it as a family-focused luxury hauler with S-Class-like comfort and some off-road capability, so it fits best if you want comfort and flexibility more than truck-like ruggedness. With 39.6% of listings marked as good or great deals, you have a decent chance of finding a competitive price.

Is the 2020 Mercedes-Benz GLS reliable?

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

The overview emphasizes a polished, upscale experience with strong standard equipment, including 4Matic all-wheel drive, Airmatic air suspension, and a long list of safety and convenience features. For used buyers, the main long-term ownership risk is that a large luxury SUV can be costly to keep in top condition, so maintenance history matters.

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

Accident-free inventory is solid at 75.2% — always verify the vehicle history report.

You should prioritize a history report first, then focus your inspection on signs of prior damage, uneven wear, or incomplete maintenance. Pay close attention to the condition of the third row, the touch-sensitive controls, and the suspension and electronics, since those are the kinds of systems that can affect ownership satisfaction in a luxury SUV.

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

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

• Deal availability: 39.6% of listings are priced as good or great deals.
• Inventory: There are 781 listings available.
• Price trend: Prices have softened 17.08% compared with last year.
• Clean inventory: 75.2% of listings are accident-free.

If you find a listing below $30,978, 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 $30,978 sits slightly below last year's $37,358.

That price movement suggests the market has already adjusted downward, which can help you as a buyer but may limit upside if you plan to resell soon. If you buy well and keep the vehicle in strong condition, you can reduce the impact of depreciation when it’s time to sell. Demand should remain supported by the GLS’s space, luxury positioning, and family-friendly utility.

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:

• 39.6% of listings are priced as good or great deals.
• Accident-free inventory is solid at 75.2% — always verify the vehicle history report.
• Price trend: Prices have softened 17.08% compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.

Consider the 2021 if:

• At $45,367, the 2021 costs more than the current year's $30,978 average.
• It adds multiple powertrain options and more advanced technology.

The bottom line:
Choose the 2020 if you want the better value and are focused on luxury space, comfort, and family usefulness. Consider the 2021 if you want to spend more for newer tech and broader powertrain choice, but the 2020 is the smarter path for price-sensitive buyers.

How does the 2020 Mercedes-Benz GLS compare to the 2020 BMW X7?

These recommendations are based on CarGurus' proprietary market data from November 10, 2026, CarGurus experts' opinions, and generative AI.