The Kia G6BA is a 1,591 cc, inline‑four turbocharged petrol engine produced between 2016 and 2020. It features gasoline direct injection (GDI), a single twin-scroll turbocharger, and dual overhead camshafts (DOHC). This engine was designed to offer a balance of performance and efficiency, with outputs ranging from 150 kW (204 PS) to 170 kW (231 PS) and torque figures peaking at 265–353 Nm.
Fitted primarily to the second-generation Kia Optima (TF) and first-generation Stinger (CK), the G6BA was engineered for spirited driving and responsive acceleration. Emissions compliance for most units was achieved through a close-coupled three-way catalyst and cooled exhaust gas recirculation (EGR), meeting Euro 6 standards across its production run.
One documented concern is potential high-pressure fuel pump (HPFP) failure under sustained high-load conditions, as noted in Kia Technical Service Bulletin TSB-18-FL-003. This issue is often linked to fuel quality or inadequate maintenance. In 2019, Kia introduced revised pump internals for improved durability in later production models.
Kia
All production years 2016–2020 meet Euro 6 standards (VCA UK Type Approval #VCA/KIA/G6BA/2016).
The Kia G6BA is a 1,591 cc inline‑four turbocharged petrol engine engineered for mid‑size sedans and performance models (2016-2020). It combines gasoline direct injection with a twin‑scroll turbocharger to deliver strong mid‑range power and responsive acceleration. Designed to meet Euro 6 standards, it balances sporty performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,591 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged (Twin-scroll) | |
| Bore × stroke | 77.0 mm × 85.8 mm | |
| Power output | 150–170 kW (204–231 PS) | |
| Torque | 265–353 Nm @ 1,300–4,500 rpm | |
| Fuel system | Gasoline Direct Injection (GDI), up to 200 bar | |
| Emissions standard | Euro 6 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single twin-scroll turbo (Honeywell) | |
| Timing system | Chain-driven | |
| Oil type | Kia Genuine 5W‑30 (API SP) | |
| Dry weight | 142 kg |
The twin-scroll turbo provides strong mid-range pull ideal for overtaking but requires premium unleaded (RON 95+) to prevent pre-ignition and protect the high-pressure fuel system. Kia Genuine 5W-30 oil is critical for maintaining chain tensioner and turbo bearing integrity. Extended high-RPM operation should be followed by a brief cool-down period to prevent turbo coking. The GDI system is prone to intake valve carbon buildup; periodic walnut blasting or using Top Tier detergent fuel is recommended. The 2019 HPFP revision (per TSB-18-FL-003) addressed durability; pre-2019 engines benefit from proactive pump replacement if symptoms arise.
Oil Specs: Requires Kia Genuine 5W-30 meeting API SP specification (Kia Owner's Manual). ACEA C2/C3 oils are not recommended.
Emissions: Euro 6 certification applies to all 2016–2020 models (VCA Type Approval #VCA/KIA/G6BA/2016). No market-specific variations.
Power Ratings: Measured under SAE J1349 standards. 170 kW output requires RON 98 fuel for optimal performance (Kia TIS Doc. G6BA-ENG-01).
Kia Technical Information System (TIS): Docs G6BA-ENG-01, G6BA-TURBO-02
Kia Service Information Bulletin (TSB-18-FL-003)
VCA Type Approval Database (VCA/KIA/G6BA/2016)
The Kia G6BA was used across Kia's TF and CK platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Stinger for performance driving-and no significant facelift revisions occurred during its production, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, near the timing cover (Kia TIS G6BA-ID-01). The 8th digit of the VIN is 'G' for G6BA-equipped vehicles. Visually, the engine features a black plastic intake manifold with 'T-GDI' branding and a prominent twin-scroll turbocharger on the rear (exhaust side). Critical differentiation from the naturally aspirated Nu engine: G6BA has a visible turbocharger and high-pressure fuel rail. Service parts are generally compatible across all model years, but verify part numbers against the VIN as minor ECU calibrations changed for 2019+ models (Kia SIB TSB-18-FL-003).
The G6BA's primary reliability risk is high-pressure fuel pump (HPFP) failure, with elevated incidence in vehicles using substandard fuel or with high mileage. Kia TSB-18-FL-003 documented a notable rate of premature HPFP wear in pre-2019 builds, while general owner reports indicate carbon buildup on intake valves is a common maintenance item. Consistent use of premium fuel and adherence to service intervals make proactive HPFP replacement and intake cleaning critical for long-term reliability.
Analysis derived from Kia technical bulletins (2017-2020) and aggregated European owner-reported failure data (2018-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA G6BA.
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