How much does the 2018 Mercedes-Benz GLS cost?

Prices have softened 12.52% compared to this time last year, making it a favorable time to shop this model year.

There are 956 listings available, which suggests you have a meaningful amount of inventory to compare.

If you find a listing below $21,849.66, that's toward the low end of the year-round range and worth acting on quickly.

Is the 2018 Mercedes-Benz GLS a good car?

Yes — the 2018 Mercedes-Benz GLS earns a 4.8/5 user rating, which points to strong owner satisfaction. Owners consistently praise its luxury features, comfort, and performance, and they also like the power delivery and the electronic features that improve the driving experience. For you, that makes it a strong fit if you want a large luxury three-row SUV with seating for six or seven people and a premium feel. 33.6% of listings are priced as good or great deals, so there is still room to shop selectively.

Is the 2018 Mercedes-Benz GLS reliable?

Owners rate it 4.8/5, a strong signal of long-term satisfaction.

The owner feedback also emphasizes that the GLS feels dependable in daily use, with comfort and performance that owners can count on over time. That kind of response matters if you want a used luxury SUV that should feel reassuring rather than fragile. For used buyers, the main long-term ownership risk is making sure the vehicle has been maintained well enough to preserve that strong ownership experience.

What should I look for when buying a used 2018 Mercedes-Benz GLS?

At 64.2% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.

You should start with a vehicle history report so you can separate clean examples from cars with prior damage or repeated claims. After that, prioritize a thorough pre-purchase inspection, especially on a luxury SUV where comfort, electronics, and suspension condition can affect ownership costs. Focus your attention on overall condition, signs of wear, and whether the vehicle has been maintained consistently.

Is now a good time to buy a used 2018 Mercedes-Benz GLS?

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

• Deal availability: 33.6% of listings are priced as good or great deals.
• Inventory: There are 956 listings available.
• Price trend: Prices have softened 12.52% compared with last year.
• Clean inventory: 64.2% of listings are accident-free.

If you find a listing below $21,849.66, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2018 Mercedes-Benz GLS's resale value?

The current average of $21,827 sits slightly below last year's $24,951.

That price movement 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 you should expect resale value to depend heavily on condition, mileage, and how well the vehicle has been maintained. Strong examples should hold up better than average ones because buyers in this segment tend to reward well-kept luxury SUVs.

Vehicles with strong owner satisfaction ratings, like this model year's 4.8/5, tend to retain buyer demand, which supports resale value over time.

Should I buy a 2018 Mercedes-Benz GLS or consider a different year?

If you're weighing the 2018 against nearby model years, here's how to think about it:

Choose the 2018 if:

• 33.6% of listings are priced as good or great deals.
• At 64.2% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 12.52% compared with last year.
• Owners rate it 4.8/5 — a strong satisfaction signal.

The bottom line: If you want the 2018 GLS, it makes the most sense as the primary choice when you value strong owner satisfaction, luxury comfort, and a market that has become more buyer-friendly. If you are especially price-sensitive, you can use the softened pricing and deal availability to focus on the cleanest, best-maintained examples rather than stretching for a newer alternative.

These recommendations are based on CarGurus' proprietary market data from August 21, 2026, CarGurus experts' opinions, and generative AI.