The Hyundai G6BA is a 2,656 cc, V6 naturally aspirated petrol engine produced between 2005 and 2010. It features dual overhead camshafts (DOHC), 24 valves, and continuous variable valve timing (CVVT) on the intake camshafts. In standard form it delivered 125–132 kW (170–180 PS) and torque figures between 247–255 Nm, providing smooth power delivery and refined cruising characteristics.
Fitted to models such as the Grandeur (TG), Sonata (NF), and Azera (MG), the G6BA was…
Hyundai
All production years 2005–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/4567).
The Hyundai G6BA is a 2,656 cc V6 naturally aspirated petrol engine engineered for mid-size and executive sedans (2005–2010). It combines DOHC architecture with intake-side CVVT to deliver smooth, linear power and quiet operation. Designed to meet Euro 4 emissions standards, it balances drivability with highway refinement and regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,656 cc | |
Fuel type | Petrol (Unleaded, RON 95 min) | |
Configuration | V6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.7 mm × 75.0 mm | |
Power output | 125–132 kW (170–180 PS) | |
Torque | 247–255 Nm @ 4,000 rpm | |
Fuel system | Sequential multi-point fuel injection (SFI) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC | |
Oil type | Hyundai SP 5W‑30 (API SM/ILSAC GF-4) | |
Dry weight | 178 kg |
The Hyundai G6BA was used across Hyundai's NF/TG platforms with longitudinal mounting and no hybrid variants. This engine received platform-specific intake manifolds—acoustic tuning in the Grandeur, revised coolant routing in the Azera, and optimized airflow in the Sonata—and from 2008 the oil pan baffle revision improved oil control, creating service part distinctions. All adaptations are documented in OEM technical bulletins.
The G6BA's primary reliability risk is oil sludge formation in high-mileage or poorly maintained units, with elevated incidence in stop-start urban use or extended service intervals. Hyundai internal service data from 2008 indicated a measurable subset of early engines exhibiting restricted oil flow and cam wear after 100,000 km, while UK DVSA records show no significant emissions-related MOT failures tied to this engine. Infrequent oil changes and use of non-specified oil amplify sludge risk, making maintenance adherence critical.
Analysis derived from Hyundai technical bulletins (2007–2010) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The G6BA is generally smooth and refined, but early models (2005–2007) are prone to oil sludge if maintenance is neglected. Post-2008 revisions and strict adherence to 7,500–10,000 km oil changes with correct 5W‑30 SP spec oil greatly improve longevity. Well-maintained examples can exceed 250,000 km without major issues.
Top issues include oil sludge buildup (pre-2008), CVVT solenoid clogging, intake manifold runner control (IMRC) failure, and water pump leaks. These are documented in Hyundai TSBs and addressed with updated service parts. Most problems are preventable with proper oil changes and correct fluid specifications.
The G6BA powered the Sonata (NF, 2005–2010), Grandeur (TG, 2005–2010), and Azera (MG, 2006–2010). All are non-hybrid, Euro 4 compliant, and use longitudinal mounting with V6 DOHC and intake-side CVVT.
Limited tuning potential. As a naturally aspirated V6, gains are modest—typically +10–15 kW via ECU remap and intake/exhaust upgrades. No factory turbo variants exist, and internal components are not designed for significant forced induction.
In a Sonata 2.7 V6, expect ~11.5 L/100km city and ~7.2 L/100km highway (~25 mpg UK combined). Real-world figures vary with driving style, but the engine prioritizes smoothness over efficiency compared to modern turbocharged units.
Yes. The G6BA is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. Regular inspection of the chain tensioner and using correct oil viscosity are critical to prevent failure.
Hyundai specifies SP 5W‑30 synthetic oil meeting API SM/ILSAC GF-4 or newer. Always use oil with adequate detergents to prevent sludge. Change every 7,500–10,000 km, especially in hot climates or stop-start driving.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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