How much does the 2018 Audi S4 cost?

Prices have softened 4.93% compared to this time last year, making it a favorable time to shop this model year.

There are 135 listings available, which gives you a modest amount of inventory to compare before you buy.

If you find a listing below $22,837.05, that's toward the low end of the year-round range and worth acting on quickly.

Is the 2018 Audi S4 a good car?

Yes — the 4.67/5 user rating points to strong owner satisfaction. The 2018 Audi S4 stands out as a performance sedan that blends strong straight-line speed with everyday usability, and it pairs that pace with standard all-wheel drive and a smooth ride for a performance car. It also brings a modern, tech-forward cabin feel through Audi’s Virtual Cockpit and Google navigation, which helps if you want a quick luxury sedan that still feels easy to live with. 30.4% 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 2018 Audi S4 is described as a refined, well-equipped performance sedan with standard all-wheel drive and a smooth ride, which supports the case for confident everyday use. At the same time, its performance focus and luxury-car complexity mean you should expect ownership to reward careful maintenance and a thorough pre-purchase check.

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

At 74.8% accident-free, a meaningful share of listings has prior incidents — history verification is especially important. You should run a vehicle history report on every candidate and prioritize examples with clean records and consistent maintenance documentation. Put extra inspection focus on body condition, signs of prior repair, and whether the car’s equipment and interior features still work as intended.

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

This is a moderate market, so you can shop selectively without expecting a deep buyer’s market.

• Deal availability: 30.4% of listings are priced as good or great deals.
• Inventory: There are 135 listings available.
• Price trend: Prices have softened 4.93% compared with last year.
• Clean inventory: 74.8% of listings are accident-free.

If you find a listing below $22,837.05, 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 $23,531 sits slightly below last year's $24,751. That softer pricing suggests the market has become a bit more favorable for buyers, but it also means future sellers may need to price competitively to stand out. Because the model still has strong appeal as a quick, well-equipped luxury sedan, clean examples should remain easier to move than neglected ones.

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:

• 30.4% of listings are priced as good or great deals.
• At 74.8% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 4.93% compared with last year.
• Owners rate it 4.67/5 — a strong satisfaction signal.

The bottom line: If you want a quick luxury sedan with standard all-wheel drive, strong everyday usability, and a market that still offers some deal opportunities, the 2018 is a sensible primary target. If you’re especially price-sensitive, you can also compare nearby years to see whether a better-equipped or better-priced example gives you more value for the money.

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