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2020 Ford F-250 Diesel Crew Cab Trucks for Sale Under $40K (2025 Guide) GuideMechanic.Com When it comes to serious towing power, long-lasting performance, and versatile cab space, few pickups can match the capability of the 2020 Ford F-250 Super Duty Diesel Crew Cab.
For those shopping on a budget, the great news is: you can now find these trucks for under $40,000 in the used market.
In this 2025 buyer’s guide, we’ll walk you through:
- Why the 2020 F-250 Crew Cab Diesel is still a top-tier choice
- What to look for in the used market
- Where to find the best deals
- And a price comparison table of actual listings under $40K
See Also: 4×4 Trucks for Sale in Las Vegas NV
2020 Ford F-250 Diesel Crew Cab Trucks for Sale Under $40K (2025 Guide)
Why Choose the 2020 Ford F-250 Diesel Crew Cab?
The 2020 F-250 is part of Ford’s fourth-generation Super Duty lineup, offering major upgrades in towing tech, engine performance, and cabin comfort. Here’s why it remains one of the best used diesel heavy-duty trucks in 2025:
- 6.7L Power Stroke Turbo Diesel V8 with 475 hp and 1,050 lb-ft torque
- Impressive towing capacity (up to 20,000 lbs conventional)
- Crew Cab configuration with seating for up to 6 passengers
- Strong chassis and frame built for work and off-road durability
- Integrated tech: SYNC infotainment, trailer assist, optional safety features
Whether you’re hauling equipment, towing an RV, or need a long-distance work truck, this model provides unmatched utility in its class.
2020 Ford F-250 Diesel Crew Cab: Price Table (2025 Listings)
Below is a selection of current used listings (based on U.S. nationwide dealer averages) for 2020 Ford F-250 Diesel Crew Cab trucks under $40,000:
| Trim Level | Drivetrain | Mileage | Bed Length | Estimated Price | Key Features |
|---|---|---|---|---|---|
| XL 4×2 | RWD | 110,000 miles | 6.75 ft | $37,900 | Base work truck, vinyl interior, tow-ready |
| XL 4×4 | 4WD | 120,000 miles | 8 ft | $39,500 | Tow pkg, steel wheels, trailer brake ctrl |
| XLT 4×2 | RWD | 105,000 miles | 6.75 ft | $38,200 | SYNC 3, cloth seats, rear camera |
| XLT 4×4 | 4WD | 115,000 miles | 6.75 ft | $39,900 | Chrome pkg, trailer assist, power windows |
| XL Long Bed 4×4 | 4WD | 125,000 miles | 8 ft | $38,000 | Fleet-owned, good maintenance, work-ready |
| XLT FX4 Off-Road 4×4 | 4WD | 130,000 miles | 6.75 ft | $39,700 | Skid plates, off-road tuned suspension |
Prices are as of mid-2025 and vary by location, dealer, and truck condition. Most under-$40K trucks will be higher mileage but still work-capable.
What to Look for in a Used 2020 F-250 Diesel
When buying a heavy-duty diesel like the F-250, condition and maintenance history matter more than flashy options. Here are key inspection points:
1. Service History
- Ask for oil change records (interval: every 7,500 miles or sooner)
- Check for fuel filter and transmission fluid replacements
- Ensure emissions systems (DEF, DPF, EGR) have not been tampered with
2. Mileage & Usage
Many 2020 F-250s under $40K have over 100K miles—but that’s normal for fleet or contractor-owned trucks. These engines are built to last beyond 250,000 miles with proper care.
Tip: Trucks used for highway hauling tend to wear less than those used for short-stop city jobs.
3. Towing Features
Confirm the truck includes:
- Trailer brake controller
- Tow/Haul mode
- Integrated trailer sway control
- Factory tow mirrors
- 3.31 or 3.55 axle ratio (for better towing performance)
4. Cab & Interior Condition
Check:
- Seat wear (cloth seats in XLTs wear better than vinyl in XLs)
- Functioning infotainment (SYNC) system
- Climate controls and rear seat comfort for crew use
Engine and Drivetrain Breakdown
The 2020 Ford F-250 diesel uses the second-gen 6.7L Power Stroke V8, paired with the 10-speed TorqShift automatic transmission. Benefits include:
- Quieter operation than previous diesels
- Excellent torque for towing heavy loads
- Reliable in cold starts and under full load
- DEF system that’s less prone to clogging (if maintained)
Where to Buy F-250 Diesel Crew Cabs Under $40K
Online Platforms
- CarGurus, AutoTrader, Cars.com – Use filters: “2020,” “Diesel,” “Crew Cab,” and “Under $40K”
- Facebook Marketplace – Often has local private or fleet listings
Commercial & Fleet Dealers
- Look for fleet resellers that rotate stock after 3–4 years. Many trucks are:
- Serviced on strict schedules
Highway driven
- Basic trims, but durable and functional
Government Surplus Auctions
- Occasionally, you’ll find 2020 F-250s from city or utility services with high mileage but great maintenance.
2020 Ford F-250 Diesel Crew Cab Trucks for Sale Under $40K (2025 Guide)
Best Trim to Target for Value
If you’re shopping under $40K, here are your top picks:
| Trim | Why Choose It |
|---|---|
| XL 4×4 | Rugged, simple, durable. Great for job sites. Minimal electronics = fewer repairs. |
| XLT 4×4 | Best mix of comfort and utility. You get power accessories, SYNC, and cloth seats. |
| FX4 Package (Optional) | Adds off-road readiness: skid plates, off-road shocks, hill descent control. Ideal if you’re on uneven terrain. |
Bonus Buying Tips
- Always run a Carfax or AutoCheck to check accident history and previous ownership.
- Check tires and brakes – these are expensive to replace on heavy-duty trucks.
- Negotiate! Many fleet sellers are open to offers, especially for trucks over 100K miles.
- Consider pre-purchase inspections if buying from a private seller or independent dealer.
Why 2020 Is a Sweet Spot Model Year
Here’s why the 2020 model year is perfect for used diesel buyers in 2025:
- Depreciation sweet spot: Already down 40%–50% from new price (~$65K+ new)
- New tech without new truck price: SYNC 3, 10-speed auto, improved emissions systems
- Still under extended warranty (in some cases), or eligible for powertrain warranty add-ons
Final Thoughts: Work-Ready Power Under Budget
A 2020 Ford F-250 Diesel Crew Cab under $40,000 offers unmatched value in 2025 for buyers who need power, space, and reliability—without paying new truck prices.
Whether you’re a contractor, hauler, rancher, or weekend tower, this truck can handle it all with confidence. With the right maintenance history and features, even high-mileage trucks in this range are built to last.
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