Used 2018 Audi S4 for SaleNationwide

How much does the 2018 Audi S4 cost?

Prices have softened 7.59% compared to this time last year, making it a favorable time to shop this model year.

There are 140 listings available, which gives you a useful amount of inventory to compare before you buy.

Is the 2018 Audi S4 a good car?

Yes — the 4.7/5 user rating points to strong owner satisfaction for this model year. The 2018 S4 is positioned as a performance sedan that still feels polished in daily driving, with a smooth ride, standard all-wheel drive, and a tech-forward cabin that includes Google navigation and Virtual Cockpit. It also fits buyers who want serious pace without giving up refinement, though it is less athletic than some BMW and Mercedes-AMG rivals. With 35% of listings marked as good or great deals, you have a decent chance of finding a competitive offer.

Is the 2018 Audi S4 reliable?

Owners rate it 4.7/5, a strong signal of long-term satisfaction.

The 2018 S4 is described as decent on reliability, but it also comes with the usual Audi tradeoff of higher maintenance needs than some rival brands. That means you should expect a premium-car ownership experience rather than a low-cost one. For used buyers, the main long-term risk is that upkeep can add up faster than it would on a more mainstream sedan.

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

At 65% 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 prior damage or repeated claims. After that, prioritize a pre-purchase inspection, especially on a performance sedan where maintenance and repair costs can be higher than average. Focus your condition check on service records, signs of wear, and whether the car has been maintained consistently rather than just how it looks in photos.

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

This looks like a moderate market for selective buyers, with enough inventory to shop carefully and enough deal activity to make a good purchase possible.

• Deal availability: 35% of listings are priced as good or great deals.
• Inventory: There are 140 listings available.
• Price trend: Prices have softened 7.59% compared with last year.
• Clean inventory: 65% of listings are accident-free.

If you find a listing below $22,509, 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 $22,509 sits slightly below last year's $24,359.

That price movement suggests the model has already absorbed a meaningful amount of depreciation, which can help limit how much value you lose from here if you buy at the right price. For a future seller, that also means your best resale outcome will likely depend on condition, mileage, and maintenance history more than on broad market appreciation. If you keep the car clean, documented, and well maintained, you give yourself a better chance of standing out in a market where shoppers are already comparing value closely.

Vehicles with strong owner satisfaction ratings, like this model year's 4.7/5, 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:

• 35% of listings are priced as good or great deals.
• At 65% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 7.59% compared with last year.
• Owners rate it 4.7/5 — a strong satisfaction signal.

The bottom line: Buy the 2018 if you want the strongest value play and are comfortable shopping carefully for condition and history. If you are more price-sensitive, you can also compare nearby years to see whether a slightly newer example offers better equipment or a cleaner ownership record for only a modest premium.

How does the 2018 Audi S4 compare to the 2018 BMW M3?

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