The Hyundai G6DA is a 2,656 cc, V6 naturally aspirated petrol engine produced between 2005 and 2010. It features a dual overhead camshaft (DOHC) 24‑valve layout with sequential multi‑point fuel injection (SFI), delivering 125–132 kW (170–180 PS) and 247–255 Nm of torque. Its compact 60° V6 cast‑iron block and aluminium heads provide smooth power delivery and inherent balance for refined operation.
Fitted to models such as the Grandeur (TG), Sonata (NF), and Azera (MG),…
Hyundai
All production years (2005–2010) meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/8456).
The Hyundai G6DA is a 2,656 cc V6 naturally aspirated petrol engine engineered for midsize and executive sedans (2005–2010). It combines DOHC architecture with sequential multi‑point fuel injection to deliver smooth, vibration‑free power and consistent torque. Designed to meet Euro 4 emissions standards, it balances refinement with serviceability and long‑term reliability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,656 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | V6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.7 mm × 75.0 mm | |
Power output | 125–132 kW (170–180 PS) @ 6,000 rpm | |
Torque | 247–255 Nm @ 4,500 rpm | |
Fuel system | Sequential multi‑point injection (SFI) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain (with polymer guide rails) | |
Oil type | Hyundai SP 10W‑40 (API SL/CF) | |
Dry weight | 178 kg |
The Hyundai G6DA was used across Hyundai's TG, NF, and MG platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Grandeur TG, updated intake manifolds in the Sonata NF, and ECU calibration refinements in the Azera MG—creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The G6DA's primary reliability risk is timing chain guide rail wear on early builds, with elevated incidence in sustained highway or hot-climate use. Hyundai internal field data from 2008 indicated a measurable rate of chain noise complaints before 120,000 km in pre‑late‑2007 units, while UK DVSA records show no significant emissions‑related MOT failures linked to this engine. High oil temperature and extended drain intervals accelerate polymer degradation, making oil quality and interval adherence critical.
Analysis derived from Hyundai technical bulletins (2006–2010) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
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The G6DA is generally smooth and durable with proper maintenance, but early models (pre-late-2007) are prone to timing chain guide wear. Later revisions addressed this with improved polymer rails. Regular oil changes using Hyundai SP 10W‑40 and avoiding sustained high-load operation greatly enhance longevity.
Top issues include timing chain guide rail degradation (pre‑late‑2007), coolant leaks from the water pump, valve cover gasket oil seepage, and throttle body carbon buildup. These are documented in Hyundai service bulletins, particularly TSB‑06‑EM‑021 for timing concerns.
The G6DA powered the Grandeur (TG, 2005–2010), Sonata (NF, 2005–2009), and Azera (MG, 2005–2010) in 2.7L V6 petrol variants. It was not licensed to other manufacturers. All applications meet Euro 4 emissions standards.
Limited tuning potential exists. The naturally aspirated V6 design and 10.4:1 compression ratio allow modest gains (~10–15 kW) via intake/exhaust upgrades and ECU remap. Forced induction is not recommended due to stock internals and lack of factory turbo provisions.
In a Sonata 2.7 V6 (132 kW), expect ~12.5 L/100km (city), ~8.0 L/100km (highway), or ~24 mpg UK combined. Real-world mixed driving typically yields 22–26 mpg UK. Economy is typical for a 2.7L V6 petrol sedan of this era.
Yes. The G6DA is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. However, the chain is designed as maintenance-free and rarely fails if oil is maintained and guides are updated.
Hyundai specifies 10W‑40 mineral or synthetic oil meeting Hyundai SP or API SL/CF standards. Using this exact viscosity is critical for timing system lubrication, especially in pre‑late‑2007 engines. Change every 10,000 km or 6 months.
Comprehensive technical documentation and regulatory references
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HYUNDAI 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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