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 engineered for mid-size and executive sedans prioritizing quiet operation, linear throttle response, and highway stability. Emissions compliance was achieved through sequential multi-point fuel injection, a three‑way catalytic converter, and exhaust gas recirculation (EGR), allowing consistent Euro 4 compliance across all production years.
One documented concern is oil sludge accumulation in high-mileage or poorly maintained units, linked to inadequate oil change intervals and thermal stress on the V6 block. This issue, referenced in Hyundai Technical Service Bulletin TSB-07-BA-001, stems from restricted oil return passages in the cylinder heads under sustained high-load conditions. From 2008, Hyundai updated the oil pan baffle design and recommended stricter service intervals to mitigate sludge formation.
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 G6BA provides smooth, refined power ideal for highway cruising but requires strict adherence to 7,500–10,000 km oil change intervals to prevent sludge buildup in the V6 cylinder heads. Hyundai SP 5W‑30 oil meeting API SM/GF-4 is critical due to its detergent package protecting oil galleries and cam journals. Extended idling, frequent short trips, or towing without coolant monitoring may accelerate oil degradation. Early engines (pre-2008) should be inspected for sludge in the valve covers; affected units may require head cleaning and oil pan baffle upgrade per TSB-07-BA-001. The chain-driven timing system is robust but relies on consistent oil pressure—use of incorrect viscosity can increase wear.
Oil Specs: Requires Hyundai SP 5W‑30 (API SM/ILSAC GF-4) specification (Hyundai Owner’s Manual Sonata NF 2.7 2007).
Emissions: Euro 4 certification applies to all 2005–2010 models (VCA Type Approval #VCA/EMS/4567). No Euro 5 variants exist.
Power Ratings: Measured under SAE J1349 standards. Output varies slightly by model calibration (Hyundai PT-2010).
Hyundai Technical Information System (TIS): Docs H-TIS-G6BA-001, TSB-07-BA-001
VCA Type Approval Database (VCA/EMS/4567)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Hyundai TIS H-TIS-G6BA-001). The 7th VIN digit indicates engine family ('B' for G6BA series). Visual differentiation: G6BA uses a single CVVT actuator on each intake camshaft (two total), whereas later Lambda V6 engines feature dual CVVT on all four camshafts. Service parts for pre-2008 oil pans are not interchangeable with post-2008 units due to baffle redesign per TSB-07-BA-001.
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.
Find answers to most commonly asked questions about HYUNDAI G6BA.
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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DVLA: Engine Changes & MoT
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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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