Used 2018 Audi S4 for SaleNationwide

How much does the 2018 Audi S4 cost?

Prices have softened 4.02% compared to this time last year, making it a favorable time to shop this model year.

There are 149 listings available, which gives you a modest amount of inventory to compare before you buy.

Is the 2018 Audi S4 a good car?

Yes — with a user rating of 4.67/5, this model year lands in strong territory for shopper satisfaction. The 2018 Audi S4 pairs strong acceleration with everyday refinement, using a turbocharged V6, an eight-speed automatic, and standard all-wheel drive to deliver quick performance without sacrificing comfort. It also brings a tech-heavy cabin with features like Virtual Cockpit and Google navigation, and it offers more standard equipment than the regular A4. If you want a performance sedan that still feels comfortable for daily driving, this setup fits that use case well. 38.3% of listings are priced as good or great deals, which gives you some room to shop selectively.

Is the 2018 Audi S4 reliable?

Owners rate it 4.67/5, a strong signal of long-term satisfaction.

The overview describes reliability as decent for these years, but it also notes that Audis typically require more maintenance than rival brands. That means you should expect ownership costs to matter more than they might on some mainstream alternatives. For used buyers, the main long-term risk is not just whether the car runs well today, but whether prior maintenance has been consistent enough to keep repair exposure in check.

What should I look for when buying a used 2018 Audi S4?

At 70.5% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.

You should start with a vehicle history report and confirm whether any reported damage was minor or structural. Put inspection priority on bodywork quality, panel alignment, tire wear, and signs of uneven repair, since condition differences can matter a lot in a performance sedan. It also makes sense to focus on maintenance records, because this model’s ownership costs can rise if routine service has been skipped.

Is now a good time to buy a used 2018 Audi S4?

This looks like a moderate market, so you can be selective without expecting a deep bargain on every listing.

• Deal availability: 38.3% of listings are priced as good or great deals.
• Inventory: There are 149 listings available.
• Price trend: Prices have softened 4.02% compared with last year.
• Clean inventory: 70.5% of listings are accident-free.

If you find a listing below $22,837, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2018 Audi S4's resale value?

The current average of $23,562 sits slightly below last year's $24,548.

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, the same trend means resale value may remain under pressure unless the car is especially clean, well maintained, and attractively equipped. If you buy carefully now, you improve your odds of holding onto value better than the average listing.

Vehicles with strong owner satisfaction ratings, like this model year's 4.67/5, tend to retain buyer demand, which supports resale value over time.

Should I buy a 2018 Audi S4 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:

• 38.3% of listings are priced as good or great deals.
• At 70.5% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 4.02% compared with last year.
• Owners rate it 4.67/5 — a strong satisfaction signal.

The bottom line: You should start with the 2018 if you want a performance sedan that blends quick acceleration, standard all-wheel drive, and a comfortable ride, especially now that prices have eased. If you are more price-sensitive, a nearby model year may be worth comparing for equipment differences and listing quality, but the 2018 remains a sensible target when you find a clean example with strong history and a competitive price.

These recommendations are based on CarGurus' proprietary market data from September 22, 2026, CarGurus experts' opinions, and generative AI.