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If your Buick Turbo Regal engine has lost compression, thrown a timing chain fault, or simply reached the end of its engine life, you don't have to choose between an expensive dealer replacement and a salvage yard gamble. At Moon Auto Parts, we stock used Buick Regal engines sourced from verified donor vehicles, inspected by certified technicians, and backed by our industry-leading 4-year / 40,000-mile warranty included at no extra cost on every unit we sell.
We carry the two most in-demand Buick Regal engine variants: the 2.0L Ecotec LHU turbocharged four-cylinder and the 2.4L Ecotec LUK eAssist four-cylinder. Both units ship free to commercial addresses anywhere in the United States, and our team verifies fitment against your VIN before every order leaves our warehouse.
Stop paying for diagnostics on an engine that cannot be saved.
The Buick Regal was offered with two primary engine options across the 2013 and 2015 Regal model years that generate the most replacement demand in today's used engine market. Understanding which engine your Regal uses and why it may be failing helps you make a confident replacement decision.
The 2.0L LHU is the performance engine of the Regal lineup. General Motors built this turbocharged inline-four to deliver 220 horsepower and 258 lb-ft of torque. A combination that made the Regal engine genuinely engaging to drive for a midsize luxury sedan. It runs on 5W-30 synthetic oil and uses GM's direct injection system paired with a turbocharger to generate its power output.
In real-world use, the LHU engine has proven mostly reliable with one consistent vulnerability, timing chain wear. Owners of 2.0L Regal engines frequently report timing chain noise beginning around 90,000 to 110,000 miles, particularly when oil change intervals were extended or lower-quality oil was used. Turbocharger boost loss is the second most commonly reported issue, typically surfacing after 80,000 miles in vehicles that were not run on the recommended 91-octane fuel. When these failures occur, a quality used LHU engine is almost always the more cost-effective solution compared to rebuilding the original unit.
The 2.4L LUK eAssist is the fuel-efficiency-focused engine in the Regal lineup, paired with GM's mild hybrid eAssist system. It produces 182 horsepower and uses a belt-integrated starter-generator to recover braking energy and reduce fuel consumption during light acceleration. The 2.4L Regal engine LUK requires 5W-30 oil and operates on regular 87-octane fuel.
The most commonly reported issue on the 2.4L LUK is timing chain stretch, which shares the same mechanical vulnerability as its 2.0L sibling. Carbon buildup on intake valves is also frequently cited by Regal owners, causing rough idle and misfires on engines that were not regularly maintained. At mileages between 80,000 and 120,000 miles, replacement becomes the most reliable and economical path forward for most owners.
When your Buick Regal's engine fails, you face three choices: rebuild the original, buy a new or remanufactured one, or source a quality second-hand engine. Here's why most experienced mechanics and Regal owners choose the used engine route and why the numbers back them up.
Rebuilding the original engine sounds straightforward, but it requires full disassembly, precise machine work, and replacement of every worn internal component. On the 2.0L LHU with timing chain failure, the total rebuild cost at an independent shop typically runs $2,800 to $4,500 with no guarantee that other internal components don't fail shortly after, since the block has already accumulated significant wear.
A new or remanufactured engine delivers factory-level quality but at a price that rarely makes financial sense for a vehicle of the Regal's age and market value. Expect to spend $4,500 to $7,000 for a remanufactured unit before labor.
A quality used engine from Moon Auto Parts gives you an OEM engine from a verified, low-mileage donor vehicle tested, graded, and covered by our 4-year/40,000-mile warranty at a price that makes economic sense for your Regal's remaining useful life. Our 2013 Buick Regal 2.0L LHU engine starts at $2,428 with 60,300 miles and grade A condition. Our 2015 Buick Regal 2.4L LUK eAssist starts at $2,600 with just 37,520 miles, one of the lowest-mileage units available anywhere in the country for this application.
The math is clear. A quality used engine costs less, ships faster, and delivers an OEM unit that hasn't been disassembled, machined, or rebuilt, which means no concerns about internal tolerances or break-in issues.
