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), Grandeu…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The G6DB is generally reliable with proper maintenance. Early units (2005–2007) may develop timing chain rattle, but with regular oil changes and correct 5W-30 oil, most engines exceed 250,000 km. The V6 layout offers inherent smoothness and durability when maintained.
Main issues include timing chain tensioner wear (early builds), intake manifold runner control failure, valve cover oil leaks, and engine mount deterioration. These are documented in Hyundai TSB-07-EM-009 and routine service advisories.
The G6DB powered the Sonata (NF, 2005–2010), Grandeur (TG, 2005–2010), and Santa Fe (CM, 2006–2010). It was used exclusively in 2.7L V6 MPi variants and complies with Euro 4 emissions across all applications.
Limited potential. As a naturally aspirated MPi V6, ECU remaps yield modest gains (+8–12 kW). Forced induction is impractical due to stock internals and fuel system limitations. Most owners prioritize smoothness and reliability over tuning.
In a Sonata 2.7 V6, expect ~11.5 L/100km (city) and ~7.8 L/100km (highway), or ~24 mpg UK combined. Real-world mixed driving typically returns 22–26 mpg UK, depending on condition and driving style.
Yes. The G6DB is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. However, the chain is robust and designed for life with proper oil maintenance.
Hyundai specifies 5W-30 synthetic oil meeting API SM or ILSAC GF-4 standards. Genuine Hyundai oil is recommended. Change every 10,000 km to protect the timing system and minimize wear.
Comprehensive technical documentation and regulatory references
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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)
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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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GOV.UK: Vehicle Approval
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