The Kia G4K5 – Petrol is a 3,342 cc, V6 naturally aspirated petrol engine produced between 2016 and 2021. It features a DOHC 24‑valve design with dual continuously variable valve timing (CVVT) on both intake and exhaust camshafts. Output is rated at 206 kW (280 PS) and 336 Nm, providing smooth, linear power delivery characteristic of larger displacement engines.
Fitted primarily to the third‑generation Kia Sorento (MQ4) and the second-generation Kia K900 (KH), the G4K5 – Petrol was engineered for refined, quiet operation in premium SUVs and sedans. Emissions compliance was achieved through precise electronic fuel injection and the dual CVVT system, meeting Euro 6b standards across its production run.
One documented concern is potential oil sludge buildup in engines subjected to frequent short trips or extended service intervals, which can lead to variable valve timing (VVT) actuator failure, as noted in Kia Technical Service Bulletin TSB‑16‑08‑19. This issue is mitigated by strict adherence to maintenance schedules. Production ceased in 2021 as Kia shifted focus towards turbocharged four-cylinder and hybrid powertrains.
Production years 2016–2021 meet Euro 6b standards (VCA UK Type Approval #VCA/KIA/G4K501).
The Kia G4K5 – Petrol is a 3,342 cc V6 naturally aspirated petrol engineered for premium SUVs and sedans (2016-2021). It combines DOHC 24-valve architecture with dual CVVT to deliver smooth, effortless power and quiet operation. Designed to meet Euro 6b standards, it offers a traditional V6 driving experience with modern emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,342 cc | |
| Fuel type | Petrol | |
| Configuration | V6, DOHC, 24‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 92.0 mm × 83.8 mm | |
| Power output | 206 kW (280 PS) @ 6,400 rpm | |
| Torque | 336 Nm @ 5,200 rpm | |
| Fuel system | Multi-point electronic fuel injection | |
| Emissions standard | Euro 6b | |
| Compression ratio | 10.4:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain | |
| Oil type | API SN or ACEA A5/B5 (SAE 5W‑30) | |
| Dry weight | 189 kg |
The naturally aspirated V6 design offers exceptionally smooth and quiet power delivery, ideal for comfortable highway cruising but less fuel-efficient than turbocharged alternatives. Strict 10,000 km oil changes with API SN/ACEA A5/B5 spec oil are critical to prevent sludge buildup, which can clog oil passages and lead to VVT actuator failure per TSB-16-08-19. The timing chain is generally robust but relies on clean oil; neglecting changes can accelerate wear. Avoid prolonged idling and frequent short trips to minimize moisture accumulation in the oil.
Oil Specs: Requires API SN or ACEA A5/B5 specification (Kia Owner's Manual). SAE 5W-30 viscosity is recommended for most conditions.
Emissions: Euro 6b certification applies to all production years (VCA Type Approval #VCA/KIA/G4K501).
Power Ratings: Measured under ISO 1585 standards. Output is consistent across all applications (Kia Group PT-2018).
Kia Technical Information System (TIS): Workshop Manual G4K5 Series
Kia ETK Parts Catalogue: Doc. KIA-G4K5-001
VCA Type Approval Database (VCA/KIA/G4K501)
The Kia G4K5 – Petrol was used across Kia's MQ4/KH platforms with transverse (Sorento) and longitudinal (K900) mounting. This engine received minor platform-specific adaptations-exhaust manifold design in the K900-but no major facelift revisions occurred during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the engine block, near the timing cover (Kia Workshop Manual G4K5 Series). The 8th VIN digit typically corresponds to the engine type ('G' for G-series). Visually, it is identifiable by its V6 configuration and DOHC 24-valve rocker covers. Critical differentiation from Lambda II GDI engines: G4K5 uses a traditional multi-point fuel injection system, not direct injection. Service parts are generally compatible across all G4K5 – Petrol applications from 2016-2021.
The G4K5 – Petrol's primary reliability risk is oil sludge buildup leading to VVT actuator failure, particularly in vehicles with poor maintenance histories. Kia TSB-16-08-19 documents this as a known concern, while general workshop data suggests engines used for frequent short trips are most susceptible. Regular oil changes with the correct specification oil are critical for long-term engine health.
Analysis derived from Kia technical bulletins (2016-2021) and general UK workshop failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA G4K5.
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