Used 2018 Mercedes-Benz GLS for SaleNationwide

How much does the 2018 Mercedes-Benz GLS cost?

Prices have softened 9.77% compared to this time last year, making it a favourable time to shop this model year.

There are 57 listings available, which gives you a modest amount of inventory to compare before you buy.

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 highlight the power it delivers along with the electronic features that improve the driving experience. The main trade-off mentioned by owners is that interior space can feel less generous than expected, with some also wanting more charging options. With 42.1% of listings marked as good or great deals, you have a solid chance of finding a competitively priced example.

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 day-to-day use, with praise centred on comfort, power, and features that make ownership feel worthwhile over time. For used buyers, that kind of satisfaction can reduce the sense of long-term ownership risk, especially if you focus on well-kept examples.

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

This looks like a buyer-friendly market for the 2018 Mercedes-Benz GLS, especially if you are comparing multiple listings and waiting for the right price.

• Deal availability: 42.1% of listings are priced as good or great deals.
• Inventory: There are 57 listings available.
• Price trend: Prices have softened 9.77% compared with last year.

If you find a listing below $32,544 CAD, 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 $32,544 CAD sits slightly below last year's $36,069 CAD.

That softer pricing suggests the market has become more favourable for buyers, but it also means future sellers may need to be realistic about where their vehicle fits in the current range. If you buy well now, you may have a better chance of limiting depreciation pressure later. Strong demand for well-rated examples can help support resale performance, especially when the vehicle has a reputation for satisfying owners.

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:

• 42.1% of listings are priced as good or great deals.
• Price trend: Prices have softened 9.77% compared with last year.
• Owners rate it 4.8/5 — a strong satisfaction signal.

The bottom line: If you want a used GLS with strong owner satisfaction and a softer price than a year ago, the 2018 is the one to focus on first. If you are especially price-sensitive, keep an eye on listings near the lower end of the range and compare them carefully against other nearby model years before deciding.

These recommendations are based on CarGurus' proprietary market data from September 29, 2026, CarGurus experts' opinions, and generative AI.