Used 2020 Mercedes-Benz GLS for Sale nearPhiladelphia, PA

How much does the 2020 Mercedes-Benz GLS cost?

Prices have softened 15.14% compared to this time last year, making it a favorable time to shop this model year.

There are 752 listings available, which suggests you should have a reasonable 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. The 2020 GLS stands out as the roomiest vehicle in Mercedes-Benz’s lineup, with three rows of seating for six or seven people and up to 94 cubic feet of cargo space. It also blends S-Class-like comfort with some off-road capability, which makes it especially appealing if you want luxury and utility in one SUV. For 2020, it also gained a curvier exterior, a wider cabin, and more comfort and safety features. With 37.1% 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 builds on a new generation with more comfort and safety features, plus a more efficient mild-hybrid powertrain. Its generous standard equipment and upscale cabin design also support the sense that it was engineered to feel substantial and well-equipped. For used buyers, the main long-term ownership risk is making sure the vehicle has been maintained carefully, since a luxury SUV with this much technology and complexity can be costly if neglected.

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

At 74.9% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.

You should run a vehicle history report before you commit, then prioritize a thorough pre-purchase inspection. Focus on body condition, signs of prior repair, and whether the cabin technology, seating, and convenience features all work as expected. Because this model is a luxury three-row SUV, condition matters a lot when you’re comparing similarly priced listings.

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

This looks like a moderate, selective buyer’s market, so you can shop carefully and still find opportunities.

• Deal availability: 37.1% of listings are priced as good or great deals.
• Inventory: There are 752 listings available.
• Price trend: Prices have softened 15.14% compared with last year.
• Clean inventory: 74.9% of listings are accident-free.

If you find a listing below $32,608, 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 $32,610 sits slightly below last year's $38,427.

That decline suggests the market has already adjusted downward, which can help you buy at a more favorable entry point today. For a future seller, it also means resale value may depend more heavily on condition, mileage, and how well the vehicle has been maintained. If you keep the SUV clean, documented, and accident-free, you’ll be in a better position when it’s time to sell.

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:

• 37.1% of listings are priced as good or great deals.
• At 74.9% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 15.14% compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.

Consider the 2021 if:

• At $47,795, the 2021 costs more than the current year's $32,610 average.
• It adds a more luxury-first character with multiple powertrain options and impressive technology.

The bottom line: If you want the better value, the 2020 is the stronger starting point because it combines a lower average price with solid satisfaction and meaningful inventory. If you’re willing to spend more for a newer model-year experience and a more upscale emphasis, the 2021 is the better secondary path. For price-sensitive buyers, the 2020 is the one to watch first.

These recommendations are based on CarGurus' proprietary market data from September 15, 2026, CarGurus experts' opinions, and generative AI.