Used 2018 Audi S4 for Sale nearPhiladelphia, PA

How much does the 2018 Audi S4 cost?

Prices have softened 3.31% compared to this time last year, making it a favorable time to shop this model year.

There are 146 listings available, which gives you a modest amount of inventory to compare before you buy.

Is the 2018 Audi S4 a good car?

Yes — the 4.67/5 user rating points to strong owner satisfaction for this model year. 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 convenience and a premium feel. With 35.6% of listings marked as good or great deals, you have a meaningful chance to find a competitive price.

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 matter. For used buyers, that means the biggest long-term risk is not just whether the car runs well today, but whether prior maintenance has been consistent and thorough.

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

At 71.9% 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 repaired properly. Put inspection priority on bodywork quality, panel alignment, and signs of inconsistent wear, then focus on overall condition and maintenance records so you can separate a clean example from one that may carry hidden costs.

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: 35.6% of listings are priced as good or great deals.
• Inventory: There are 146 listings available.
• Price trend: Prices have softened 3.31% compared with last year.
• Clean inventory: 71.9% 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 $23,731 sits slightly below last year's $24,544.

That softer pricing suggests the market has already adjusted downward, which can help you buy at a more favorable entry point today. For a future seller, that also means resale value will depend heavily on how well the car is maintained and how clean its history is when it comes time to trade or sell. A well-kept example should be easier to move than one with accident history or deferred maintenance.

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:

• 35.6% of listings are priced as good or great deals.
• At 71.9% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 3.31% compared with last year.
• Owners rate it 4.67/5 — a strong satisfaction signal.

The bottom line: The 2018 Audi S4 makes the most sense if you want a performance sedan with strong owner satisfaction, a softer current price, and enough inventory to shop carefully. If you are especially price-sensitive, you may want to focus on the best-value listings first and be willing to compare nearby model years for the right combination of condition and deal quality.

These recommendations are based on CarGurus' proprietary market data from September 15, 2026, CarGurus experts' opinions, and generative AI.