Collection: Used Buick Engines For Sale

Browse Buick Engines by Year

Our Buick engine inventory covers every model year from 1990 through 2022. Year-specific pages are not yet live for Buick — text us your VIN and we will match the exact engine for your vehicle within minutes.

Buick Engines We Cover

Real Buick engines from our warehouse, tested and ready to ship. A single model year can ship with more than one engine, so match by engine code rather than by vehicle — text us your VIN and we will confirm it.

3.8L 3800 V6 (L27 / L36 / L67 / L26 / L32)

LeSabre, Park Avenue, Regal, Riviera, Century, Lucerne, LaCrosse and Allure (1990–2009). Our deepest Buick line — the Series I, II and III 3800, listed by VIN code because the supercharged L67 and L32 (VIN 1, VIN 4) in the Park Avenue Ultra, Riviera and Regal GS and the naturally aspirated L36 and L26 (VIN K, VIN 2) do not interchange.

2.4L Ecotec Inline-4 (LE5 / LE9 / LAF / LEA)

Verano (2012–2017), Regal (2011–2017), LaCrosse (2010–2016), LaCrosse and Regal eAssist. The direct-injected Ecotec 2.4 — listed by VIN code because the LAF, the LEA eAssist engine with its own accessory drive, and the LE5 and LE9 of the earlier cars carry different intakes and controllers.

3.6L High Feature V6 (LY7 / LLT / LFX / LGX)

Enclave (2008–2022), LaCrosse (2008–2019), Rendezvous (2006–2007), Regal GS (2020), Envision. The DOHC 3.6 in four generations — the port-injected LY7, the direct-injected LLT and LFX, and the 2017-on LGX with stop-start — each listed by VIN code, and the Enclave unit is not the LaCrosse unit of the same year.

2.0L Turbo Ecotec (LHU / LTG / LSY)

Regal and Regal GS (2011–2020), Verano Turbo (2013–2016), LaCrosse (2013–2016), Envision (2016–2022). The turbo 2.0 in three builds — the LHU of the first Regal, the LTG of 2014-on, and the LSY of the 2019-on Envision — listed by VIN code because the turbos, intakes and controllers do not swap.

3.1L / 3.3L / 3.4L Pushrod V6 (LG7, LH0, L82, LG8, LA1)

Century (1990–2005), Regal (1990–2004), Skylark (1990–1998), Rendezvous 3.4 (2002–2005), Terraza. The 60-degree pushrod V6 in most of its forms — the 3300 of the early Century and Skylark, the 3.1 of the Century and Regal, and the 3.4 of the Rendezvous, listed by VIN code and by Federal or California emissions where GM split them.

2.5L Ecotec and Tech IV Inline-4 (LCV, LKW)

LaCrosse (2013–2019), Regal (2014–2017), Envision 2.5 (2016–2020), Century and Skylark 2.5 Tech IV (1990–1992). The direct-injected 2.5 LCV and LKW of the current cars and the pushrod Iron Duke of the early 1990s share a displacement and nothing else — listed by VIN code on every unit.

1.4L / 1.2L / 1.3L Turbo Ecotec (LUV, LE2, LIH, L3T)

Encore (2013–2022), Encore GX (2020–2022). The small turbo fours — the Encore is listed by VIN B (LUV) or VIN M (LE2) because the 2017-on LE2 carries a different head and turbo, and the Encore GX 1.2 and 1.3 three-cylinders are listed by FWD or AWD.

LS4 5.3L and Northstar 4.6L V8

LaCrosse Super and Allure 5.3 (2008–2009), Lucerne 4.6 Northstar (2006–2011), Rainier 5.3 (2004–2007). The V8 Buicks — the transverse LS4 in the LaCrosse Super, the 4.6 Northstar in the Lucerne CXS and Super (VIN Y and VIN 9 listed separately in 2008), and the Vortec 5.3 in the Rainier, each listed by VIN code.

5.7L / 5.0L Small-Block and Rainier 4.2L (Roadmaster, Commercial Chassis)

Roadmaster (1991–1996), Commercial Chassis 5.7 and 7.4 (1991–1996), Rainier 4.2 (2004–2007). The rear-drive Buicks — the LT1 and L05 350 in the Roadmaster, the truck 5.7 and 7.4 of the chassis-cab builds listed by VIN code and 3500 HD, and the Atlas 4.2 inline-six in the Rainier.

More Buick Engines

Plus 3.5L and 3.9L LZ4 and LZ9 V6 for the LaCrosse, Allure and Terraza, 3.0L LF1 Envision and LaCrosse units, Cascada 1.6L turbo, Regal 2.2L and 2.3L Quad 4 fours, Skylark 2.3L, and 1990s Reatta and Riviera 3800 units — text us your VIN.

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Why Buy a Used Buick Engine from Auto Power Source

Buick has shared every engine with the rest of GM and run the same displacement across engines that do not swap — a 3.8 is a supercharged L67 or a naturally aspirated L36 depending on the eighth VIN digit, a 3.6 is a port-injected LY7 or a direct-injected LLT, LFX or LGX depending on the year, a 2.4 is an LAF or an eAssist LEA, and a 2.0 turbo is an LHU, an LTG or an LSY. Every product on this page is titled by VIN code and by the emissions and build splits GM put inside the same year. Our 454 verified Buick engines cover the whole run: the 3800 in the LeSabre, Park Avenue, Regal, Riviera, Lucerne and LaCrosse, the Ecotec 2.4 in the Verano, Regal and LaCrosse, the 3.6 in the Enclave, LaCrosse and Envision, the turbo 2.0 in the Regal, Verano and Envision, the 3.1, 3.3 and 3.4 pushrod V6s in the Century, Regal, Skylark and Rendezvous, the 2.5 in the LaCrosse and Envision, the small turbo fours in the Encore and Encore GX, the LS4 and Northstar V8s, and the small-block and Atlas engines of the Roadmaster, Commercial Chassis and Rainier.

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 goes through our six-step inspection — VIN-matching against the donor and against your vehicle, compression and leak-down testing of every cylinder, noise verification, full visual inspection of block, heads and timing cover, multi-angle photography for your approval, and palletized freight. 3800 units get an intake-manifold and coolant-elbow check, 3.6 units get a timing-chain review, and 1.4 and 2.0 turbo units get a PCV and turbo-shaft inspection. Rejected units never reach the buyer.

You pay a fraction of dealer-new pricing for the same GM engineering, ship free on a heavy-duty pallet anywhere in the continental U.S., and have 30 days from delivery to return for any reason — no restocking fees. The warranty printed on the listing — with extended coverage up to 3 years available — covers you if anything goes wrong after install. Across 100K+ engines and transmissions in stock, we hold a 0% fitment-related return rate.

Your Buick Engine Options: Compared

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

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

Learn More: Buyer Guides

Practical guides from our team — how to install a used 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 or transmission — what to inspect, prep, and torque before first start.

Post-Install Maintenance Checklist

Keep your used unit running like new — the break-in period, fluid 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 unit arrives — freight damage, matching numbers, and what to photograph.

Frequently Asked Questions

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