Used 2018 Mercedes-Benz GLS for Sale near Colorado

How much does the 2018 Mercedes-Benz GLS cost?

Prices have softened 11.53% compared to this time last year, making it a favorable time to shop this model year.

There are 929 listings available, which suggests you should have a solid range of options to compare.

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 luxurious features, comfort, and performance, and they also like the power delivery and the electronic features that improve the driving experience. The GLS is especially appealing if you want a full-size luxury SUV with three rows, generous cargo space, and a family-focused layout that still feels upscale.

With 35.1% of listings marked as good or great deals, you have a meaningful chance to find a competitive price if you shop carefully.

Is the 2018 Mercedes-Benz GLS reliable?

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

The owner feedback points to a vehicle that feels dependable in daily use, with praise centered on comfort, features, and the way it delivers power without drama. That kind of response usually matters most if you want a luxury SUV you can count on for regular family duty and longer ownership.

For used buyers, the main long-term risk is less about the overall ownership experience and more about making sure the specific vehicle has been maintained well and hasn’t picked up costly wear from prior use.

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

At 65.9% 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 those with accident records. After that, prioritize a thorough pre-purchase inspection, especially on the suspension, electronics, and interior condition, since those are the areas where a luxury SUV can become expensive if previous care was lacking.

You should also focus on how the cabin has held up, because this model is meant to deliver a premium family experience and condition matters a lot in that role.

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

This looks like a moderate, selective buyer’s market, so you can shop with some leverage if you stay patient and compare listings closely.

• Deal availability: 35.1% of listings are priced as good or great deals.
• Inventory: There are 929 listings available.
• Price trend: Prices have softened 11.53% compared with last year.
• Clean inventory: 65.9% of listings are accident-free.

If you find a listing below $20,650, 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 $20,934 sits slightly below last year's $23,663.

That decline 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 at the right price, you reduce the chance of taking a bigger depreciation hit later.

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:

• 35.1% of listings are priced as good or great deals.
• At 65.9% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 11.53% compared with last year.
• Owners rate it 4.8/5 — a strong satisfaction signal.

The bottom line: You should lean toward the 2018 if you want a well-equipped luxury SUV and can verify a clean, well-maintained example at a competitive price. If you’re especially price-sensitive, a nearby year may be worth comparing, but the 2018 stands out as a strong value play when you find one with good history and condition.

How does the 2018 Mercedes-Benz GLS compare to the 2019 BMW X7?

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