The Kia G4KE is a 1,591 cc, inline‑four naturally aspirated engine produced from 2015 to present. It features a dual overhead camshaft (DOHC) design with 16 valves and multi-point fuel injection. This refined powerplant delivers 123 PS, offering smooth, linear power delivery ideal for daily commuting and urban driving.
Fitted primarily to the second-generation Kia Optima (JF) and third-generation Ceed (CD), the G4KE was engineered for dependable, economical performance with low running costs. It targets buyers seeking hassle-free ownership and predictable dynamics in a mid-size family vehicle. Emissions compliance is achieved through a close-coupled catalytic converter, meeting Euro 6 standards.
One documented consideration is the potential for premature wear of the hydraulic timing chain tensioner, a known characteristic noted in Kia technical service bulletins for the JF Optima. This issue can lead to chain noise and, in severe cases, timing jump if neglected. Kia addressed this with revised tensioner components in later production runs.
Kia
Production years 2015–Present meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/9123).
The Kia G4KE is a 1,591 cc inline‑four naturally aspirated engine engineered for mid-size family vehicles (2015-Present). It combines DOHC 16-valve architecture with multi-point fuel injection to deliver smooth, predictable power. Designed to meet Euro 6 standards, it prioritizes reliability, fuel efficiency, and low emissions for everyday use.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,591 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 77.0 mm × 85.4 mm | |
| Power output | 90 kW (123 PS) @ 6,300 rpm | |
| Torque | 154 Nm @ 4,500 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 SP, SAE 5W-30 | |
| Dry weight | Not Available |
The naturally aspirated design offers predictable, linear power ideal for relaxed driving but requires adherence to 10,000-mile oil change intervals to maintain timing chain and valve train longevity. API SP 5W-30 oil is critical for protecting engine components. The known tensioner issue necessitates inspection during service; replacement with updated OEM tensioners per Kia TSB is recommended to prevent timing issues. High-quality 95 RON fuel is recommended for optimal performance.
Oil Specs: Requires API SP specification (Kia Owner's Manual). ACEA A5/B5 is an acceptable equivalent for fuel economy.
Emissions: Euro 6 certification applies to all 2015–Present G4KE models (VCA Type Approval #VCA/EMS/9123).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across all model years (Kia PT-2023).
Kia Technical Workshop Manual: JF Optima / CD Ceed (2015-Present)
Kia ETK Parts Catalogue: Document KIA-G4KE-2015
VCA Type Approval Database (VCA/EMS/9123)
The Kia G4KE was used in Kia's JF/CD platforms with transverse mounting. This engine received minor ECU updates during its production run but no major mechanical platform-specific adaptations. All applications are documented in OEM service manuals.
Locate the engine code stamped on the front of the cylinder block, near the alternator (Kia Workshop Manual JF). The 8th digit of the VIN for G4KE-equipped vehicles is typically 'G'. The engine is visually identified by its compact size, aluminum DOHC cylinder head, and the absence of a turbocharger. Critical differentiation from the turbocharged G4KN: The G4KE has a simpler intake manifold without a charge pipe or intercooler connection. Always verify the engine code stamping before ordering parts.
The G4KE's primary reliability risk is hydraulic timing chain tensioner failure, with elevated incidence in early-production or poorly maintained units. Kia service data indicates a significant number of tensioner replacements, while owner reports frequently cite this as the main concern. Neglecting oil changes or using incorrect viscosity makes tensioner failure significantly more likely.
Analysis derived from Kia technical bulletins (2015-Present) and owner-reported service data (2016-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA G4KE.
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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