The Genesis Smartstream G3.5T is a 3,497 cc, V6 twin — turbocharged petrol engine introduced in 2023 as part of the brand's Smartstream efficiency initiative. It features gasoline direct injection, Continuously Variable Valve Duration (CVVD), and an aluminum block/heads for reduced weight. Peak output is rated at 294 kW (400 PS), delivering 530 Nm of torque, enabling strong, linear acceleration.
Fitted exclusively to the facelifted GV80 SUV and G80 sedan, the Smartst…
All production years (2023–Present) meet Euro 6d-TEMP standards .
The Genesis Smartstream G3.5T is a 3,497 cc V6 twin-turbo petrol engineered for flagship luxury SUVs and sedans (2023-Present). It combines direct injection with twin-scroll turbochargers and CVVD technology to deliver powerful, smooth acceleration and enhanced fuel efficiency. Designed to meet Euro 6d-TEMP standards, it balances high performance with advanced emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,497 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Twin-turbocharged | |
Bore × stroke | 92.0 mm × 87.7 mm | |
Power output | 294 kW (400 PS) @ 5,800 rpm | |
Torque | 530 Nm @ 1,300–4,500 rpm | |
Fuel system | Gasoline direct injection (GDi) | |
Emissions standard | Euro 6d-TEMP | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Twin-scroll turbochargers (IHI) | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 210 kg |
The Genesis Smartstream G3.5T was developed for the facelifted Genesis GV80 and G80 platforms with longitudinal mounting. This engine features the latest Smartstream technologies, including CVVD, which are not backward-compatible with pre-facelift G4K2 engines. All applications are documented in OEM technical bulletins.
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The Smartstream G3.5T's primary documented service consideration is the calibration sensitivity of its CVVD system. Genesis service bulletins provide specific diagnostic protocols for related fault codes. Using the correct 0W-20 oil and avoiding non-OEM software modifications are critical preventative measures.
Analysis derived from Genesis technical bulletins (2023-2024) and aggregated owner service data (2023-2024). 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 Smartstream G3.5T is a cutting-edge engine with no widespread critical failures reported. Its main long-term consideration is the sensitivity of the CVVD system, which requires strict adherence to using the specified 0W-20 oil and factory software. With proper maintenance, it is expected to be very reliable.
The most frequently noted items are potential CVVD system calibration faults (addressed in SIB SI-G35T-001), occasional minor oil consumption during break-in, and rare coolant sensor faults. These are generally service or maintenance items rather than inherent design flaws.
The Smartstream G3.5T is used exclusively in the facelifted (2023+) Genesis G80 luxury sedan and GV80 luxury SUV, specifically in their '3.5T' trim levels. It replaces the previous G4K2 engine in these models.
While tuning is technically possible, Genesis strongly advises against it due to the complexity of the CVVD system. Non-OEM ECU modifications can disrupt valve timing calibration, leading to fault codes, reduced efficiency, or potential damage. Tuning will also void the factory warranty.
Official combined figures are approximately 10.0 L/100km (28 mpg UK) for the GV80 and 9.8 L/100km (29 mpg UK) for the G80, representing a slight improvement over the previous G4K2 thanks to CVVD. Real-world figures will vary based on driving style.
Yes. Like virtually all modern overhead cam engines, the Smartstream G3.5T is an interference design. A timing chain failure could result in severe engine damage. The chain is designed for longevity with proper maintenance and correct oil usage.
Genesis mandates 0W-20 viscosity oil meeting the latest API SP (or ILSAC GF-6A) standard. This specific viscosity is crucial for the optimal operation of the CVVD system and overall engine protection. Using Genesis Genuine Oil or an approved equivalent is essential.
Comprehensive technical documentation and regulatory references
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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
Type-approval guidance and documentation.
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