How much does the 2018 Mercedes-Benz S-Class cost?

Prices have softened 8.96% compared to this time last year, making it a favorable time to shop this model year.

There are 740 listings available, which gives you a meaningful amount of inventory to compare.

If you find a listing below $33,447.51, that's toward the low end of the year-round range and worth acting on quickly.

Is the 2018 Mercedes-Benz S-Class a good car?

Yes — the 4.79/5 user rating points to very strong owner satisfaction. Drivers consistently praise the luxurious interior, advanced technology, smooth performance, high-quality craftsmanship, and spacious cabin. That makes sense if you want a full-size flagship sedan that emphasizes comfort, refinement, and a premium feel over everyday simplicity. With 29.7% of listings marked as good or great deals, you still have room to shop selectively.

Is the 2018 Mercedes-Benz S-Class reliable?

Owners rate it 4.79/5, a strong signal of long-term satisfaction.

The review summary also points to a dependable ownership experience, with drivers describing the car as smooth, trouble-free, and well suited to long-term use. That said, this is still a complex luxury sedan, so used buyers should expect maintenance and repair costs to matter more than they would on a mainstream car. For you, the key risk is not just whether the car runs well today, but whether its service history supports continued long-term ownership.

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

At 64.1% 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 collision records or repeated claims. After that, prioritize a pre-purchase inspection from a shop that understands high-end German luxury cars, since condition and maintenance quality matter a lot on this model. Focus especially on signs of deferred upkeep, uneven wear, and any evidence that expensive systems were not properly serviced.

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

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

• Deal availability: 29.7% of listings are priced as good or great deals.
• Inventory: There are 740 listings available.
• Price trend: Prices have softened 8.96% compared with last year.
• Clean inventory: 64.1% of listings are accident-free.

If you find a listing below $33,447.51, that's toward the low end of the year-round range and worth acting on quickly.

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

The current average of $33,503 sits slightly below last year's $36,802.

That price movement suggests the market has already adjusted downward, which can help you buy more carefully now but may also limit short-term upside if you plan to resell soon. For a future seller, the main takeaway is that condition, mileage, and service history will matter even more when the broader market is softening. Well-kept examples should still attract attention, but you should not expect a strong price premium unless the car is especially clean and well documented.

Vehicles with strong owner satisfaction ratings, like this model year's 4.79/5, tend to retain buyer demand, which supports resale value over time.

Should I buy a 2018 Mercedes-Benz S-Class 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:

• 29.7% of listings are priced as good or great deals.
• At 64.1% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 8.96% compared with last year.
• Owners rate it 4.79/5 — a strong satisfaction signal.

The bottom line: If you want the best balance of value and flagship luxury, the 2018 is the one to target first because pricing has eased and owner satisfaction is very strong. If you are especially price-sensitive, you can widen your search to nearby years and compare condition, accident history, and asking price closely, since the best deal may come down to the individual listing rather than the model year alone.

These recommendations are based on CarGurus' proprietary market data from August 28, 2026, CarGurus experts' opinions, and generative AI.