Is the $20,999 price on this 2018 Mercedes-Benz S-Class a good deal?

OAV rates this as Fair Price because the asking price of $20,999 is within the typical market range for this vehicle.

What is the average price for a 2018 Mercedes-Benz S-Class in WI?

Based on 14 comparable listings in WI, the average asking price for a 2016-2020 Mercedes-Benz S-Class is $40,099, with prices ranging from $20,995 to $102,750.

How long does a 2018 Mercedes-Benz S-Class typically stay on dealer lots?

Comparable Mercedes-Benz S-Class listings in WI spend an average of 122 days on dealer lots.

Where is this 2018 Mercedes-Benz S-Class located?

This vehicle is listed in Prairie Du Chien, WI 53821. VIN: WDDUG6EB0JA347906. Mileage: 128,400 miles.

No Photo Available

Vehicle Details

VINWDDUG6EB0JA347906

TrimS450

Exterior ColorBlack

Drivetrain4WD

Engine3.0L V6

TransmissionAutomatic

Fuel TypePremium Unleaded

Inventory Typeused

Days on Lot65

2018 Mercedes-Benz S-Class

S450

Unscored

$20,999128,400 mi

Prairie Du Chien, WI 53821

Is this 2018 Mercedes-Benz S-Class S450 a good deal?

OAV verdict: Unscored

Why: Listed at $20,999, comparable market range $20,999–$20,999. Days on lot: 65 days (market average 122 days).

Market price position

$20,999 · only listing at this price

$20,999 — single data point

Regional range: $20,999 (0 listings)
vs. market: Exact match — no spread
Comparable vehicles: 0

Market Retail Price (MRP™)

$20,999

This vehicle $20,999 · priced at MRP

MRP™ is the midpoint of the comparable market range — the representative price the market is asking for similar vehicles. How MRP works.

True Retail Value (TRV™)

$20,861

This vehicle $20,999 · $138 (1%) above TRV

TRV™ is the average paid price for cars like this in the last 60 days (sold data through 2026-07-25) — an estimate, not an appraisal. How TRV works.

Demand-Verified· Backed by recent sales data

Similar vehicles recently sold in an estimated 19–124 days.

Royce Auto Llc

Prairie Du Chien, WI

OAV routes your inquiry; pricing, taxes, fees, and availability come from the dealer.

View all vehicles from royce auto llc →

Request availability and out-the-door price

OAV will route your inquiry to Royce Auto Llc for current availability of this 2018 Mercedes-Benz S-Class S450 and an out-the-door price quote (taxes, fees, addons included).

OAV routes your inquiry; pricing, taxes, fees, and availability come from the dealer.

About This 2018 Mercedes-Benz S-Class

Listing updated: Jul 25, 2026

Listed by an independent dealer in Prairie Du Chien, WI · On lot for 65 days · VIN verifiable at NHTSA

This used 2018 Mercedes-Benz S-Class S450 is listed at $20,999 by royce auto llc in Prairie Du Chien, WI 53821. It has 128,400 miles on the odometer. The exterior color is Black. It features a 4WD drivetrain with a 3.0L V6 engine and Automatic transmission.

OAV's AI-powered Price-to-Market analysis rates this vehicle as Unscored due to insufficient comparable data. Based on available similar vehicles in the Prairie Du Chien market, the estimated market range is $20,999 to $20,999.

This vehicle has been on the lot for 65 days.

Analysis powered by OAV's patented inventory standardization technology (U.S. Patent No. 12,236,477).

Market context

This listing is part of OAV's broader Prairie Du Chien, WI sedans market analysis. OAV compares vehicles using local and regional price-to-market ranges, days-on-lot, comparable count, and demand signals where available.

How this deal is rated

OAV compares this 2018 Mercedes-Benz S-Class against similar vehicles currently available in the local and regional market — same make, model, and year range, filtered for comparable mileage. Based on where this listing falls in that comparable set, it is rated:

Great Deal — priced below the typical range for comparable vehicles.
Fair Price — priced within the expected range for comparable vehicles.
Overpriced — priced above the typical range for comparable vehicles.

Listings show OAV's PTM-derived deal quality and live market context. OAV-claimed dealers manage their listing profile and route buyer inquiries directly. Paid OAV partners surface additional verification signals.

How this listing is verified

This vehicle listing was aggregated from an independent dealer in Prairie Du Chien, WI, one of 57,000+ U.S. dealerships in OAV's nationwide inventory network.The VIN WDDUG6EB0JA347906 can be independently verified via the U.S. Department of Transportation's NHTSA VIN decoder, and safety recalls at NHTSA's recall database.

Vehicle attributes (year, make, model, trim, mileage, location) are standardized using OAV's patented methodology (U.S. Patent No. 12,236,477), which normalizes naming conventions and deduplicates cross-listed inventory across the dealership network. Listing data is processed daily; Price-to-Market analysis uses comparable vehicles within the same geographic market.

2018 Mercedes-Benz S-Class Market in WI

Comparable Vehicles

Average Price

$40,099

Price Range

$20,995–$102,750

Avg Days on Lot

122

Based on 14 comparable 2016-2020 Mercedes-Benz S-Class listings in WI, the average asking price is $40,099. This listing at $20,999 is $19,100 below average (48% below market). Comparable prices in WI range from $20,995 to $102,750. Similar vehicles spend an average of 122 days on dealer lots in this market.