The Genesis G4KJ is a 3,497 cc, V6 twin — turbocharged petrol engine introduced in 2021. It features gasoline direct injection (GDi), dual continuously variable valve timing (CVVT), and an aluminum block and heads. In standard form for the GV80 SUV, it produces 272 kW (365 PS) and 530 Nm of torque, enabling strong, linear acceleration.
Fitted primarily to the flagship GV80 SUV and G80 sedan, the G4KJ was engineered for refined, powerful performance with everyday usability…
Genesis
All production years (2021–Present) meet Euro 6d-TEMP-EVAP-ISC standards universally (VCA UK Type Approval #VCA/EMS/5678).
The Genesis G4KJ is a 3,497 cc V6 twin-turbo petrol engineered for flagship SUVs and sedans (2021-Present). It combines gasoline direct injection with dual variable valve timing to deliver potent, linear power and refined operation. Designed to meet Euro 6d standards, it balances high performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,497 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Twin-turbocharged | |
Bore × stroke | 92.0 mm × 87.7 mm | |
Power output | 272 kW (365 PS) | |
Torque | 530 Nm @ 1,300–4,500 rpm | |
Fuel system | Gasoline Direct Injection (GDi) | |
Emissions standard | Euro 6d | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Twin low-inertia turbochargers | |
Timing system | Chain-driven | |
Oil type | Genesis Genuine Oil 5W-30 (API SP) | |
Dry weight | 212 kg |
The Genesis G4KJ is used exclusively in Genesis's G80 and GV80 platforms with longitudinal mounting. This engine features platform-specific ECU calibrations for sedan versus SUV weight and gearing, creating interchange limits for control units. All adaptations are documented in OEM technical bulletins.
The G4KJ's primary documented focus is on long-term GPF health, with potential issues arising from predominantly urban driving. Genesis service data indicates low failure rates for core components, while UK DVSA records show no systemic MOT failures linked to this engine. Short trips and low-speed operation can impede GPF regeneration, making periodic highway driving critical.
Analysis derived from Genesis technical bulletins (2021-2024) and UK DVSA failure statistics (2022-2024). Repair procedures should follow manufacturer guidelines.
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Early data suggests the G4KJ is robust. Its primary long-term consideration is GPF maintenance through appropriate driving. Using the correct 5W-30 oil and premium fuel, along with adhering to service schedules, is key to ensuring reliability over 100,000 km and beyond.
The most frequently noted items are GPF soot accumulation from short trips and minor, within-spec oil consumption. Intake valve cleaning may be needed as preventative maintenance. A brief turbo wastegate rattle on cold start is normal, not a defect.
The G4KJ 3.5L twin-turbo petrol engine is used in the Genesis G80 luxury sedan (3.5T trim) and the Genesis GV80 luxury SUV (3.5T trim) from the 2021 model year onwards. It is not used in any other Genesis or Hyundai/Kia models.
Yes, the G4KJ has tuning potential. ECU remaps can safely increase output by 30-50 kW. The engine's robust internals and twin-turbo design support moderate power gains. However, tuning may void the warranty and accelerate wear on components like the transmission and differentials.
Official combined figures are ~10.5 L/100km (27 mpg UK) for the GV80 and ~10.2 L/100km (28 mpg UK) for the G80. Real-world consumption varies greatly: expect 13-16 L/100km (18-22 mpg UK) in city driving and 8-9 L/100km (31-35 mpg UK) on the highway.
Yes. The G4KJ is an interference engine. If the timing chain were to fail catastrophically, piston-to-valve contact would occur, resulting in severe internal engine damage requiring a rebuild or replacement.
Genesis mandates the use of Genesis Genuine Oil 5W-30 meeting API SP specification. Using the correct low-viscosity, high-quality synthetic oil is crucial for protecting the turbochargers, timing chain, and ensuring optimal GPF function.
Comprehensive technical documentation and regulatory references
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GENESIS 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
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