The GM LNS is a 2,457 cc, inline‑four petrol engine produced between 2013 and 2017. It features dual overhead camshafts (DOHC), variable valve timing (VVT), and direct fuel injection. In standard form it delivered 132 kW (177 PS), with peak torque of 240 Nm, providing smooth, efficient power for compact applications.
Fitted to models such as the Chevrolet Cruze, Buick Verano, and Cadillac ATS, the LNS was engineered for a balance of refinement, fuel economy, and responsiv…
Production years 2013–2017 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/5682).
The GM LNS is a 2,457 cc inline-four petrol engine engineered for compact and premium compact sedans (2013-2017). It combines DOHC with direct injection and variable valve timing to deliver smooth, responsive power and improved fuel efficiency. Designed to meet Euro 5 standards, it represents GM's focus on refined, efficient four-cylinder powertrains.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,457 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 101.0 mm | |
Power output | 132 kW (177 PS) @ 6,200 rpm | |
Torque | 240 Nm @ 4,900 rpm | |
Fuel system | SIDI (Spark Ignition Direct Injection) | |
Emissions standard | Euro 5 | |
Compression ratio | 11.2:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | GM Dexos1 Gen 2 (SAE 5W-30) | |
Dry weight | 125 kg |
The GM LNS was used across GM's Delta II and Alpha platforms with transverse mounting. This engine received platform-specific adaptations-unique engine mounts for the Cadillac ATS and specific intake manifolds for the Chevrolet Cruze-creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The LNS's primary reliability consideration is potential failure of the high-pressure fuel pump (HPFP), a documented service item in GM bulletins. While not universal, GM internal data indicated a notable service rate for this component, making prompt diagnosis and replacement with revised parts critical for maintaining drivability.
Analysis derived from GM technical bulletins (2013-2017) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
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The LNS is a smooth and refined engine. Its main long-term considerations are potential HPFP failure and managing intake valve carbon buildup. With regular maintenance, including strict oil changes using Dexos1 Gen 2 and periodic intake cleaning, these engines can reliably exceed 200,000 km.
The most frequent issues are potential failure of the high-pressure fuel pump, carbon buildup on intake valves, wear of the timing chain tensioner, and oil consumption due to piston ring wear in high-mileage examples. These are well-documented in GM service information.
The LNS 2.5L I4 was used in the Chevrolet Cruze (2013-2015), Buick Verano (2013-2017), and Cadillac ATS (2013-2014). It was the standard four-cylinder option for these models, offering a balance of power and efficiency.
Yes, the LNS responds well to tuning. Simple ECU flashes can unlock 10-15 kW of additional power by optimizing timing and fuel maps. More aggressive modifications are possible but offer diminishing returns due to the engine's naturally aspirated design.
Fuel economy is good for a 2.5L naturally aspirated engine. In a 2014 Cruze, expect around 11.5 L/100km in the city and 7.5 L/100km on the highway, averaging approximately 9.5 L/100km (30 mpg UK) combined. Actual figures vary significantly with driving style and conditions.
Yes. The LNS is an interference engine. If the timing chain fails or jumps significantly, the pistons can collide with the open valves, causing catastrophic internal engine damage. The timing chain is generally durable, but maintaining proper oil level and quality is crucial.
GM mandates the use of Dexos1 Gen 2-approved 5W-30 full synthetic oil. This specific formulation is critical for protecting the engine's high-compression design and variable valve timing system. Change intervals should not exceed 10,000 km or 12 months, whichever comes first.
Comprehensive technical documentation and regulatory references
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GM Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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