The Hyundai G6DB is a 2,656 cc, V6 naturally aspirated petrol engine produced between 2005 and 2010. It features dual overhead camshafts (DOHC), 24 valves, and Hyundai’s Continuously Variable Valve Timing (CVVT) system on the intake camshafts. In standard form it delivered 125–132 kW (170–180 PS) with torque figures between 247–255 Nm, offering smooth power delivery and refined performance for mid-size sedans and SUVs.
Fitted to models such as the Sonata (NF), Grandeur (TG), and Santa Fe (CM), the G6DB was engineered for balanced highway cruising, quiet operation, and dependable daily use. Emissions compliance was achieved through precise electronic throttle control, exhaust gas recirculation (EGR), and a three-way catalyst, allowing Euro 4 compliance across all production years.
One documented concern is premature timing chain tensioner wear, which in some cases led to chain rattle or misalignment. This issue was noted in Hyundai Technical Service Bulletin TSB-07-EM-009 and primarily affected engines produced before mid-2008. From 2009 onward, Hyundai implemented revised tensioner materials and guide rail geometry to improve durability.
Hyundai
All production years 2005–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/4321).
The Hyundai G6DB is a 2,656 cc V6 naturally aspirated petrol engine engineered for mid-size sedans and SUVs (2005–2010). It combines DOHC architecture with intake-side CVVT to deliver smooth power delivery and low-end torque. Designed to meet Euro 4 emissions standards, it balances refinement with moderate fuel consumption for its era.
| 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 | Multi-point fuel injection (MPi) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.4:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven DOHC | |
| Oil type | Hyundai Genuine 5W‑30 (API SM/ILSAC GF‑4) | |
| Dry weight | 168 kg |
The V6 layout provides inherent smoothness but requires consistent oil quality to maintain timing chain and CVVT function. Hyundai Genuine 5W-30 (API SM) oil is critical due to its high-temperature stability and shear resistance, which protect the chain tensioner and cam phasers. Engines built before 06/2008 may exhibit timing chain rattle; owners should listen for cold-start noise and inspect tensioner condition. The timing chain is designed for life but relies on clean oil—extended intervals risk premature wear. Fuel injectors are robust but benefit from periodic cleaning to maintain idle smoothness.
Oil Specs: Requires Hyundai Genuine 5W-30 meeting API SM/ILSAC GF-4 (Hyundai SIB TSB-07-EM-009).
Emissions: Euro 4 certification applies to all G6DB production years (VCA Type Approval #VCA/EMS/4321).
Power Ratings: Measured under SAE J1349 standards. Power varies by model calibration (Hyundai TIS Doc. HEM-G6DB-04).
Hyundai Technical Information System (TIS): Docs HEM-G6DB-01 through HEM-G6DB-04, TSB-07-EM-009
VCA Type Approval Database (VCA/EMS/4321)
SAE International: J1349 Engine Power Certification Standards
The Hyundai G6DB was used across Hyundai's NF/TG/CM platforms with transverse mounting in front-wheel-drive applications. This engine received platform-specific adaptations—revised engine mounts in the Santa Fe CM and modified intake manifolds in the Sonata NF—and from 2008 the facelifted Grandeur TG retained the same block but with updated ECU calibration. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front-left side of the block near the timing cover (Hyundai TIS HEM-G6DB-02). The 7th VIN digit for Hyundai Sonata NF is 'V' for V6 variants. All G6DB units feature silver valve covers with dual oil filler caps (one per bank) and lack direct injection rails. Critical differentiation from Lambda V6 (G6DA): G6DB uses MPi (not GDi), has no high-pressure fuel pump, and exhibits simpler intake manifold. Service parts for tensioners and guides are production-date sensitive—verify build date before ordering (Hyundai TSB-07-EM-009).
The G6DB's primary reliability risk is timing chain tensioner wear in early builds, with elevated incidence in high-mileage or warm-climate use. Hyundai internal field data from 2009 indicated a subset of pre-2008 engines required tensioner replacement before 120,000 km, while UK DVSA records show low emissions-related failures due to robust Euro 4 compliance. Extended oil change intervals and infrequent level checks increase wear risk, making proactive inspection critical.
Analysis derived from Hyundai technical bulletins (2005–2010) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HYUNDAI G6DB.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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