Collection: Used Buick Engines For Sale

Browse Buick Engines by Year

Year-specific pages coming online weekly — text us your VIN and we will match you to the right Buick engine from our verified inventory today.

Buick Engines We Cover

Real engines from our warehouse, tested and ready to ship. Our Buick inventory spans every major Buick engine family produced for the U.S. market.

GM 3.6L V6 High-Feature (LY7/LLT/LFX)

Enclave, Lacrosse, Lucerne CXS, Regal. The volume modern Buick V6 — dual VVT, 60-degree architecture. LY7 / LLT / LFX variants.

3800 3.8L V6 Series II/III (Iconic Buick)

Park Avenue, Park Avenue Ultra (supercharged L67), Regal GS supercharged, Lacrosse 3.8L L26, Riviera. Cast-iron pushrod V6 — the iconic Buick engine.

GM 3.1L / 3.4L V6 OHV (LG8/LA1)

Century 3.1L 1990s-2005, older Regal 3.1L base, older Lacrosse 3.4L. Cast-iron pushrod V6 — the volume small-V6 of the 1990s/2000s.

GM LS4 5.3L V8 Transverse FWD (Rare)

Buick Allure CXS, Lacrosse Super, Pontiac Grand Prix GXP, Chevy Impala SS. Rare FWD-V8 application with displacement on demand. Performance demand.

GM Ecotec 2.4L Inline-Four (LAF/LEA)

Verano 2.4L, Lacrosse 2.4L base, Regal 2.4L base. Modern compact GM four-cylinder — LEA variant adds direct injection. Tested and warrantied.

GM 2.0L LTG Turbo Inline-Four

Regal GS 2.0T, Verano Turbo, Lacrosse 2.0T, Cascada. Twin-scroll turbocharger, direct injection — modern Buick performance four. Tested and warrantied.

GM 1.4L LUJ/LUV Turbo Inline-Four

Encore 1.4T, Verano base, Cascada 1.4T. Small-displacement turbo with direct injection — compact crossover engine. Tested and warrantied.

GM Ecotec 1.6L LWC Turbo Inline-Four

Cascada 1.6T, modern Encore 1.6T, Encore GX. Modern small turbo-four with direct injection. Tested and warrantied.

GM Iron Duke / Tech IV 2.2L / 2.5L I4

Older Century 2.2L base, older Skylark base 1990s. Cast-iron simple OHV or SOHC four — the older Buick economy four. Tested and warrantied.

GM 3.0L LF1 V6 / 2.5L LCV I4 (eAssist)

Lacrosse 3.0L V6 base, Lacrosse 2.5L eAssist mild-hybrid, Regal 2.5L. Modern direct-injection variants — some paired with eAssist mild-hybrid system.

Buick 5.7L 350 / 5.0L 305 V8 (Classic)

Roadmaster 5.7L LT1, Estate Wagon, older Riviera 5.0L. GM small-block V8 — classic 1990s full-size sedan/wagon V8. Tested and warrantied.

Why Buy a Used Buick Engine from Auto Power Source

We have spent over a decade sourcing quality Buick engines from carefully vetted suppliers across North America. Our 446+ verified Buick engines span every major Buick engine family across model years from the 1990s through present. Every Buick engine we sell has been pulled from a low-mileage donor vehicle, cataloged by VIN, and held in our climate-controlled warehouse pending sale.

Each unit went through our six-step inspection — VIN-matching, ASE testing, noise & smoke verification, full visual inspection, multi-angle photography, and palletized shipping. Our ASE-certified technicians compression-test every cylinder and run leak-down evaluation on engines. Transmissions are Shift-Tested through all gears — rejected units never reach the buyer.

You pay a fraction of dealer-new pricing for identical Buick engineering, ship free on a heavy-duty pallet anywhere in the continental U.S., and get 30 days from delivery to return for any reason — no restocking fees. Up to a 3-year warranty covers you if anything goes wrong after install. Across 46,000+ engines and transmissions shipped, we hold a 0% fitment-related return rate.

Your Buick Engine Options: Compared

Most Buick owners face four real choices when their engine fails:

Tested used OEM hits the sweet spot — same engineering as new, fraction of the cost.

Buick Engine Buying Guide

Five things to verify before buying a used Buick engine:

1. Match the engine code by VIN. Buick engines often share displacement but differ in compression, valvetrain, and emissions hardware. Always verify the engine code, not just "3.5L V6" — it could be one of several different units.
2. Confirm trim and emissions package. California-emissions ULEV variants, federal-emissions models, and PZEV variants often share displacement but use different ECU calibration and exhaust hardware.
3. Verify auto vs. manual transmission application. Buick flywheel and starter geometry can differ between AT and MT applications even at the same displacement.
4. For turbocharged variants, ask about turbo condition. Inspect the turbocharger compressor and turbine wheels, wastegate, and intercooler condition before paying.
5. Always run the donor vehicle VIN if available. We provide this on request for any engine in our inventory — helping you verify mileage and service history.

Our ASE-certified technicians verify every one of these points against your VIN before any engine ships.

Frequently Asked Questions

Related Collections