The Kia G4LA – Petrol is a 2,359 cc, inline‑four naturally aspirated engine produced between 2015 and 2020. It features dual overhead camshafts (DOHC), multi — point fuel injection, and Kia’s Dual CVVT system for intake and exhaust camshafts. This configuration delivers 136 kW (185 PS) and 241 Nm of torque, prioritizing smooth, linear power delivery for confident highway cruising and urban versatility.
Fitted to models like the Optima and Sorento, the G4LA – Petrol was en…
Production years 2015–2020 meet Euro 6 standards for applicable markets (VCA UK Type Approval #VCA/EMS/5685).
The Kia G4LA – Petrol is a 2,359 cc inline‑four naturally aspirated engine engineered for mid-size sedans and SUVs (2015-2020). It combines DOHC architecture with Dual CVVT on both intake and exhaust camshafts to deliver smooth, linear power and good fuel efficiency. Designed to meet Euro 6 standards, it offers a refined balance of performance and low running costs for daily commuting and longer journeys.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,359 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 88.0 mm × 97.0 mm | |
Power output | 136 kW (185 PS) @ 6,000 rpm | |
Torque | 241 Nm @ 4,000 rpm | |
Fuel system | Multi-point fuel injection | |
Emissions standard | Euro 6 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | API SN/SM, ACEA A5/B5, SAE 5W-20 | |
Dry weight | Not Available |
The Kia G4LA – Petrol was used across Kia's TF/MQ platforms with transverse mounting. This engine received platform-specific adaptations-such as revised engine mounts for the Sorento-creating minor interchange considerations. All adaptations are documented in OEM technical bulletins.
The G4LA – Petrol's primary documented service concern is VVT oil control valve clogging, often linked to extended oil change intervals or use of incorrect oil viscosity. While generally robust, UK DVSA data shows a minor correlation between neglected maintenance and emissions-related faults. Consistent use of correct 5W-20 oil specification and timely changes are critical for long-term reliability.
Analysis derived from Kia technical bulletins (2015-2020) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
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Yes, generally very reliable. The G4LA is known for its simplicity and robust design. The main potential issue is VVT solenoid clogging if oil changes are neglected or the wrong oil viscosity is used. With regular maintenance using the specified 5W-20 oil, these engines are expected to easily surpass 200,000 km without major problems.
The most frequently documented issue is the VVT oil control valve becoming clogged, triggering a check engine light. Other potential, less common concerns include high-pressure fuel pump failure in very high-mileage units and minor carbon buildup on intake valves affecting cold-start performance.
This 2.4L petrol engine was primarily used in the third-generation facelift Kia Optima (TF platform, 2015-2020) and the third-generation Kia Sorento (MQ platform, 2015-2020). It was the standard non-turbo petrol engine for these models during that production period.
Significant power gains are limited due to its naturally aspirated design. Basic ECU remaps might yield minor improvements in throttle response, but substantial increases require forced induction, which is complex and costly. Most owners find the standard power delivery adequate for its intended use.
Good for its class. Expect real-world combined figures of 9.0-10.5 L/100km (27-31 mpg UK) depending on the model (Optima vs Sorento), driving style, and condition. Highway cruising can yield figures closer to 7.5 L/100km (38 mpg UK), while city driving may increase consumption to 11.5 L/100km (25 mpg UK).
Yes. The G4LA – Petrol is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing severe internal engine damage. Fortunately, the chain is very durable with proper maintenance.
Kia specifies a 5W-20 viscosity grade oil meeting API SN/SM or ACEA A5/B5 standards. This low-viscosity oil is crucial for optimal fuel economy, cold-start performance, and protecting the Dual CVVT system. Using the correct specification is essential for long-term reliability.
Comprehensive technical documentation and regulatory references
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KIA Official Site
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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
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