Collection: Used Buick Engines For Sale

Browse Buick Engines by Year

Pick your model year for VIN-matched inventory. More year pages coming online weekly — if your year is not yet linked, text us your VIN and we will match you.

Buick Engines We Cover

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

3800 Series II/III V6

LeSabre, Park Avenue, Regal (1995-2005), Riviera. GM 3800 3.8L pushrod V6 — legendary for durability, but 1995-2005 units have LOWER INTAKE MANIFOLD GASKET FAILURE (Dex-Cool coolant erosion). We inspect intake gasket condition on every 3800 in inventory.

LGX 3.6L V6 (LaCrosse/Enclave)

LaCrosse (2016+), Enclave (2018+), Regal Sportback. GM's modern LGX 3.6L V6 with direct injection and cylinder deactivation. Timing chain wear past 100K miles is documented — inspect on high-mileage units.

LTG 2.0L Turbo (Regal/LaCrosse)

Regal GS (2014-2019), LaCrosse (2013+), Regal Sport (2011-2017). GM Ecotec 2.0L direct-injection turbo four. PCV valve and timing chain are the two documented wear points — inspect both before install.

LFV 1.5L Turbo Ecotec (Envision)

Envision (2016+), Encore GX (2020+), Regal Sportback (2018+). GM Ecotec 1.5L turbo I4 — direct injection with carbon buildup risk past 60K. Walnut-blast intake at install for best result.

LZ4/LZ9 3.5L V6 (LaCrosse)

LaCrosse (2005-2009), Rendezvous, Terraza. GM 3.5L V6 pushrod — modernized 3800 architecture. Lower intake gasket concern shared with 3800 family. Chain-driven, no timing belt.

LWE 2.5L Ecotec (LaCrosse/Regal)

LaCrosse (2013+), Regal (2014+), Verano (2013-2017). GM Ecotec 2.5L direct-injection four (some with iVLC intake). Cleaner sourcing than turbo variants — no boost-related wear.

HFV6 3.6L Turbo V6 (Regal GS)

Regal GS (2010-2013). GM twin-cam V6 — enthusiast-driven demand, verify no aftermarket tuning history. Limited production, specialist sourcing typical.

Ecotec 1.4L Turbo (Encore/Verano)

Encore (2013-2022), Verano (2013-2017). GM Ecotec 1.4L turbo I4 — early years (2013-2015) had TIMING CHAIN and PCV issues documented. We inspect chain condition and PCV integrity on every 1.4T in inventory.

LEA 2.4L Ecotec (LaCrosse eAssist)

LaCrosse eAssist (2012-2016), Regal eAssist (2012-2016). Mild-hybrid application with 2.4L I4 and small electric motor. Verify eAssist system compatibility if targeting an eAssist chassis.

5.7L 350 / 5.0L 305 SB V8 (Vintage)

Roadmaster (1994-1996), Estate Wagon. GM small-block V8 — shared with Chevy Caprice/Impala SS of the same era. Vintage donor pool, huge parts availability. Simple pushrod V8.

More Buick Engines

Plus 3.5L LX9, 3.4L LA1, and other GM-shared variants — text us your VIN.

Trustpilot

Why Buy a Used Buick Engine from Auto Power Source

Buick's modern engine catalog is fully GM-shared: the LGX 3.6L V6 in LaCrosse and Enclave is the same block as Cadillac XT5 and Chevy Traverse; the LTG 2.0L turbo in Regal GS is shared with Cadillac ATS and Chevy Malibu; the LFV 1.5L turbo Ecotec in Envision powers Chevy Equinox and GMC Terrain too. That parts commonality is Buick's greatest strength in the used market — a donor Chevy or GMC engine can VIN-match a Buick chassis when the engine code aligns. The older lineage matters too: the legendary 3800 Series II/III 3.8L V6 in 1995-2005 LeSabre and Park Avenue has one of the most durable pushrod histories in modern American cars, tempered by a well-known lower intake manifold gasket vulnerability.

Our 400+ Buick engines all come from low-mileage donor vehicles, cataloged by VIN, and held in our climate-controlled warehouse. Every unit clears our six-step process: VIN-matched to donor and target, ASE-certified compression test on every cylinder, leak-down evaluation, run-stand noise & smoke verification, visual inspection, multi-angle photographs for your approval, and palletized freight. On 3800 Series II/III units we specifically inspect lower intake manifold gasket condition and Dex-Cool coolant history. On LGX 3.6L V6 we inspect timing chain wear past 100K. On 1.4L Ecotec turbo (Encore/Verano) we verify timing chain condition — the 2013-2015 units are the documented risk window. On LTG 2.0T we inspect PCV and chain condition.

You pay a fraction of dealer pricing for identical Buick engineering, ship free on a heavy-duty pallet to any address in the continental U.S., and get 30 days from delivery to return — no restocking fees. Up to a 3-year warranty covers you after install. Across 100,000+ Engines+Transmissions In Stock, our fitment-related return rate stays at 0%.

Buick Engine Buying Guide

Five things to verify before buying a used Buick engine:

1. 3800 Series II/III lower intake manifold gasket failure. The 3.8L 3800 V6 in 1995-2005 LeSabre, Park Avenue, and Regal has a documented lower intake manifold gasket failure caused by Dex-Cool coolant erosion. Symptoms include coolant loss, oil-coolant intermix, and eventual overheating. We inspect gasket condition on every 3800 in inventory and disclose any signs of prior gasket work.
2. Encore/Verano 1.4L turbo timing chain (2013-2015). The Ecotec 1.4L turbo in early Encore (2013-2016) and Verano (2013-2017) has documented timing chain stretch and PCV valve failures on 2013-2015 units. Symptoms include check-engine lights, misfires, and eventual chain skip. Later 2016+ units use improved parts. We verify chain condition and PCV integrity before listing.
3. LGX 3.6L V6 timing chain wear past 100K. The modern LGX 3.6L V6 in LaCrosse (2016+) and Enclave (2018+) is shared across GM. Timing chain wear is documented on high-mileage units past 100K — symptoms include timing codes and rough starts. We check chain condition via borescope on all LGX units over 100K donor mileage.
4. Buick engines are GM-shared — donor flexibility is high. Because Buick's modern engines are GM-corporate (LGX with Chevy Traverse/Cadillac XT5, LTG with Cadillac ATS, LFV with Chevy Equinox), a donor engine from a Chevy or GMC chassis can VIN-match a Buick target when the engine code aligns. This expands sourcing significantly — text us your VIN and we'll look across the whole GM donor pool.
5. LTG 2.0T PCV and carbon buildup (Regal/LaCrosse). The Ecotec 2.0L turbo in Regal GS (2014-2019) and LaCrosse (2013+) uses direct injection — carbon buildup is expected past 60K, and PCV valve failures are documented. Walnut-blast intake ports at install for best result. We inspect PCV condition on every LTG in inventory.

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

Learn More: Buick Engine Guides

Practical guides from our team — how to install a used Buick engine, what to check on delivery, and what really matters when buying online.

APS Preinstallation Guide

Step-by-step guide to properly installing a used engine — what to inspect, prep, and torque before first start.

Post-Install Maintenance Checklist

Keep your used engine running like new — the break-in period, oil intervals, and warning signs to watch for.

5 Things to Know Before Buying

Warranty terms, VIN matching, mileage, testing, return policy — the checklist every buyer should run through.

After Delivery: Inspection Guide

What to check the moment your engine arrives — freight damage, matching numbers, and what to photograph.

Frequently Asked Questions

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