2
verified units in stock
2020 Used Chevy Silverado 3500 Engines For Sale
2 verified 2020 Chevy Silverado 3500 engines in stock — both 6.6L, one diesel (VIN Y, opt L5P) and one gasoline (VIN 7, opt L8T). On this truck the fuel type is the fitment: same displacement, different engine entirely. Every unit is VIN-matched to your vehicle, compression-tested by ASE-certified technicians, photographed before shipment, and backed by up to a 3-year warranty plus 30-day money-back. Free freight nationwide.
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Compression-Tested & Verified
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Free Nationwide Shipping
2020 Silverado 3500 Engine Options In Stock
Both in-stock 2020 Silverado 3500 engine fitments, separated by fuel type and VIN code. Every unit is VIN-matched at the order step — text us your VIN if you are unsure which applies.
Why Buy a 2020 Chevy Silverado 3500 Engine from Auto Power Source
Every 2020 Silverado 3500 engine we list is inventory-verified against its donor vehicle, cataloged by VIN, and held in our climate-controlled warehouse pending sale. Our ASE-certified technicians compression-test every cylinder and run a leak-down evaluation before any unit is cleared for sale.
Both 2020 Silverado 3500 engines we stock are 6.6L, so displacement alone will not tell you which one you need — the diesel (opt L5P, VIN Y) and the gasoline (opt L8T, VIN 7) are entirely different engines that happen to share a number. The 8th VIN digit and the option code are what separate them. Text your VIN and we will confirm the exact match before you order.
📱 Fastest way to match: text us your VIN, get options in minutes.Text Your VIN →
Your 2020 Silverado 3500 Engine Options: Compared
Most 2020 Silverado 3500 owners face four real choices when their engine fails:
← Swipe sideways to see all columns →
| Option |
Cost |
Reliability |
Warranty |
Fitment Match |
| Used OEM (this collection) |
$$$ Best Value |
High |
Up to 3 years |
VIN-matched |
| New OEM (dealer) |
$$$$$ 2-4× more |
High |
Manufacturer |
Exact |
| Aftermarket / Reman |
$$$$ |
Varies |
6-12 mo |
May adapt |
| Junkyard |
$ Cheapest |
Unknown |
None |
DIY |
Tested used OEM hits the sweet spot — same Chevy engineering as new, fraction of the cost.
2020 Silverado 3500 Engine Buying Guide
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Confirm the 8th-digit VIN code. The 2020 Silverado 3500 diesel ships under VIN Y and the gasoline under VIN 7 — with both engines at 6.6L, the 8th digit is what separates them.
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Match the engine option code. Our diesel unit is opt L5P and our gasoline unit is opt L8T; the option code is cataloged on every listing.
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Do not order on displacement alone. Both units read 6.6L. Diesel and gasoline share nothing that matters here — fuel type is the fitment, so confirm it before you order.
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Check brackets and ancillaries. Accessory mounting and sensor harnesses can differ between fitments — tell us what came off the car.
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Always run the donor VIN if available. We provide it on request for any Silverado 3500 engine in inventory to verify mileage and history.
Our ASE-certified technicians verify every one of these points against your VIN before any engine ships.
Frequently Asked Questions
What is the warranty on a 2020 Silverado 3500 engine?
Up to 3 years, depending on the specific unit. The exact warranty term is listed on each product page.
What does compression-tested mean?
ASE-certified technicians compression-test every cylinder and run a leak-down evaluation before the engine is cleared for sale.
How long until delivery?
Prep and ship time is 3-5 business days. Transit time is 2-3 business days via freight carrier after dispatch.
Can I see photos before I buy?
Yes. Multi-angle photos of the actual unit are sent before payment.
Do I need my VIN?
Strongly recommended. Both 2020 Silverado 3500 engines are 6.6L — only the 8th VIN digit and the option code tell the diesel and the gasoline apart.
What if I do not approve the photos?
Every dollar back — no restocking fees, no return freight charges.
46,000+
engines + transmissions shipped
0%
fitment-related returns
All 50
states covered, free freight
Excellent
Customer Reviews
rated on Trustpilot
Our 6-Step Inspection & Shipping Process
Every 2020 Silverado 3500 engine we ship has been through these six steps:
1. VIN-MatchingWe match the donor VIN to your VIN to confirm engine code, emissions calibration, and drivetrain fit.
2. Tested & VerifiedASE-certified technicians compression-test every cylinder and run a leak-down evaluation on each engine.
3. Noise & Smoke VerificationUnits are run to verify normal mechanical sound and clean operation — catches wear static tests miss.
4. Visual InspectionEvery accessible component is inspected: intake and exhaust manifolds, valve covers, accessories, sensor harnesses.
5. Photograph & CatalogMulti-angle photos sent to you BEFORE we ship, for your approval.
6. Palletize & ShipStrapped on a heavy-duty wooden pallet, shipped via freight at no charge.
What Our Customers Say
Rated Excellent by our customers on Trustpilot.
★★★★★
Transaction was perfect
"Found me the right engine at a great price. Got it in 2 days and installed the car the next day. Runs absolutely beautiful."
— Kevin Graham, 2026-04-29
★★★★★
Repeat customer
"AutoPowerSource is a great company. I've used them several times for used motors. Low mileage when other companies gave up."
— Curtis Haines, 2025-12-23
★★★★★
Highly recommend Mike
"Mike reached out first thing in the morning regarding my inquiry for a used engine. Very informative and helpful."
— Beatrice, 2026-03-31
★★★★★
Great experience
"Daisy kept me in the loop every step. My original engine was damaged before shipping; she found a different one quickly."
— Bryan Perkins, 2026-03-25
Our Photos-Before-Shipment Guarantee
Before any 2020 Silverado 3500 engine leaves our warehouse, we send you multi-angle photographs. You approve. If you do not approve, you get every dollar back — no questions, no restocking fees, no return freight charges. On top of 30-day money-back and up to a 3-year warranty.
✉ Email Us at info@autopowersource.com
