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Cheap Used Diesel Trucks for Sale Under $20K GuideMechanic.Com For truck enthusiasts and workers alike, diesel trucks are prized for their torque, towing power, and long engine life.
But buying new can be expensive, with some models costing over $70,000. The good news? There are still plenty of reliable used diesel trucks available for under $20,000—if you know where to look.
In this article, we’ll explore the best cheap used diesel trucks under $20K, what to watch out for, and where to find great deals. Whether you’re a contractor, rancher, or weekend warrior, there’s a diesel pickup out there that fits your budget.
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Cheap Used Diesel Trucks for Sale Under $20K
Why Choose a Diesel Truck?
- More Torque for Towing – Diesel engines produce high torque at low RPMs, ideal for hauling.
- Better Fuel Economy – Diesels typically get better MPG than gas trucks in highway and towing conditions.
- Longer Lifespan – Diesel engines, when well-maintained, can last 300,000+ miles.
- Resale Value – Diesel trucks tend to hold their value better, even at higher mileage.
What You Can Expect for Under $20,000
When shopping for diesel trucks under $20K, you’ll generally be looking at:
- Model years 2010 and older, with some exceptions.
- Mileage ranging from 120,000 to 250,000+ miles.
- Three-quarter-ton (2500) and one-ton (3500) models are common in this price range.
- Mostly domestic brands like Ford, Chevrolet, GMC, Ram, and older Dodge trucks.
Best Used Diesel Trucks Under $20K (2025 Market)
| Make & Model | Engine | Year Range | Avg. Price | Towing Capacity |
|---|---|---|---|---|
| Ford F-250 Super Duty | 6.0L / 6.4L Power Stroke | 2004–2009 | $12K–$18K | 12,000+ lbs |
| Ford F-350 Super Duty | 6.0L Power Stroke | 2003–2007 | $10K–$19K | 13,000+ lbs |
| Ram 2500 / 3500 | 5.9L / 6.7L Cummins | 2003–2011 | $13K–$20K | 13,000+ lbs |
| Chevrolet Silverado 2500HD | 6.6L Duramax LBZ / LMM | 2004–2010 | $14K–$19K | 12,000+ lbs |
| GMC Sierra 2500HD | 6.6L Duramax | 2004–2010 | $13K–$19K | 12,000+ lbs |
| Ford Ranger (diesel, import) | 3.2L Duratorq (limited) | 2012–2015* | $16K–$20K | 7,000+ lbs |
*Note: U.S.-spec Rangers are typically gas-powered; diesel versions are rare and usually imports or fleet-only.
Cheap Used Diesel Trucks for Sale Under $20K
Best Places to Find Cheap Used Diesel Trucks
1. Used Car Dealerships
Local dealerships often stock older trade-ins or fleet trucks. Many offer financing and basic warranties.
2. Facebook Marketplace / Craigslist
Private sellers often price lower than dealers. Ideal for budget-conscious buyers, but do your due diligence on maintenance history.
3. Online Classifieds
Platforms like CarGurus, Autotrader, CommercialTruckTrader, and DieselSellerz specialize in used diesel trucks.
4. Government & Auction Sales
City, county, or utility auctions often sell diesel fleet trucks that are well-maintained but high-mileage.
What to Look for in a Used Diesel Truck
Must-Have Checks:
- Service Records – Consistent oil changes, fuel filter replacements, and injector servicing.
- Engine Condition – Check for excessive smoke, hard starts, and turbocharger function.
- Transmission Health – Diesel trucks often tow—so inspect for slipping or delayed shifting.
- Rust Check – Focus on undercarriage, especially if the truck is from northern states.
Common Problems to Avoid:
- Ford 6.0L Power Stroke (2003–2007) – Known for EGR and head gasket issues (bulletproofed models are okay).
- High-Tuned Engines – Trucks that have been “chipped” or tuned aggressively may have premature wear.
- Neglected Maintenance – Skip any truck with unclear service history or signs of poor upkeep.
Tips for Finding the Best Deals
- Expand Your Search Radius – Look outside your city for rural areas where trucks may be less expensive.
- Negotiate Based on History – Use mileage and maintenance as leverage to reduce price.
- Use Vehicle History Reports – Services like Carfax or AutoCheck can reveal accidents, title issues, and maintenance records.
- Get a Diesel Mechanic to Inspect – Spending $100–$200 for a pre-purchase inspection can save you thousands.
Cheap Used Diesel Trucks for Sale Under $20K
Who Should Buy a Used Diesel Truck?
- Towing Enthusiasts – Boats, trailers, RVs—diesel torque handles them all.
- Construction/Tradespeople – Great for hauling tools and materials all day long.
- Rural and Ranch Workers – Long highway distances and heavy-duty use suit diesel performance.
- Budget-Conscious Buyers – You get big power and longevity at a fraction of new truck prices.
Financing and Insurance Considerations
Financing:
- Many banks won’t finance vehicles over 10 years old or with high mileage, so look into:
- Credit Unions
- In-house dealer financing
- Personal loans
Insurance:
- Older diesel trucks tend to be cheaper to insure, especially if listed as personal/work use rather than commercial.
Are There Any Diesels Under $20K with Low Miles?
It’s tough, but possible:
- 2011–2014 Chevrolet Colorado Duramax (Used, High Miles)
- 2006–2007 Ram 2500 with Cummins 5.9L (150k miles)
- Fleet-maintained 2012 Ford F-250 6.7L (200k+ miles)
You’ll likely need to compromise on mileage, trim level, or cosmetic condition to stay under $20,000.
Final Thoughts: Diesel Power Without the Premium Price
Finding a cheap used diesel truck under $20,000 is absolutely possible—and for many, it’s the best way to get the towing and hauling performance they need without going into debt.
With smart research, a thorough inspection, and a bit of patience, you can drive away with a powerful, long-lasting diesel truck that’s ready to work hard for years to come.
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