Used 2018 Audi S4 for Sale near New Jersey

How much does the 2018 Audi S4 cost?

Prices have softened 3.75% compared to this time last year, making it a favorable time to shop this model year.

There are 148 listings available, which suggests you have a modest amount of inventory to compare.

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 pairs strong acceleration with everyday refinement, and it also rides very smoothly for a performance sedan, which helps if you want speed without giving up comfort. It offers more standard equipment than the regular A4, and its tech-heavy cabin adds appeal if you value a well-equipped daily driver. With 35.1% of listings marked as good or great deals, there is still 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, so ownership costs remain part of the equation. For used buyers, that means the biggest long-term risk is not just whether the car runs well today, but whether it has been maintained consistently enough to avoid expensive surprises later.

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

At 73.6% 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. After that, prioritize a thorough pre-purchase inspection, especially on a performance sedan where maintenance history and condition matter more than mileage alone. Focus on signs of deferred upkeep, uneven wear, and any evidence that the car has been driven hard or repaired poorly.

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

This is a moderate market, so you can be selective without expecting every listing to be a bargain.

• Deal availability: 35.1% of listings are priced as good or great deals.
• Inventory: There are 148 listings available.
• Price trend: Prices have softened 3.75% compared with last year.
• Clean inventory: 73.6% of listings are accident-free.

If you find a listing below $22,840, 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 $23,890 sits slightly below last year's $24,821.

That price movement suggests the model has already absorbed some depreciation, which can help you if you buy at the right number and hold the car for a while. If you later sell, a lower entry price can reduce the amount you lose to depreciation over your ownership period. The key is to buy a well-kept example, because condition and maintenance history will matter when it is time to resell.

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:

• 35.1% of listings are priced as good or great deals.
• At 73.6% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 3.75% compared with last year.
• Owners rate it 4.67/5 — a strong satisfaction signal.

The bottom line: If you want a performance sedan with strong acceleration, everyday comfort, and a price that has eased from last year, the 2018 is a sensible primary target. If you are especially price-sensitive, you may also want to compare nearby years and focus on the cleanest, best-maintained example rather than chasing the newest badge alone.

These recommendations are based on CarGurus' proprietary market data from September 11, 2026, CarGurus experts' opinions, and generative AI.