The Lexus 8AR-FTS is a 1,998 cc, inline‑four turbocharged petrol engine produced between 2014 and 2020. It features Toyota's D-4S twin-injection system (combining direct and port injection), a twin-scroll turbocharger, and VVT-iW variable valve timing. This technology delivers a broad torque curve, with peak output of 175 kW (238 PS) and 350 Nm, providing strong low-rpm torque for effortless acceleration.
Fitted to models such as the IS 200t, GS 200t, and NX 200t, the 8AR-FTS was engineered for refined, responsive performance with an emphasis on smoothness and quiet operation. Emissions compliance was achieved through its advanced combustion system and a close-coupled catalytic converter, meeting stringent Euro 6 standards from launch.
One documented concern is carbon buildup on the intake valves, inherent to direct-injection engines, which can affect idle quality and fuel economy over time. This is addressed in Toyota/Lexus Technical Service Bulletin EG-0078-15, which outlines the cleaning procedure. The engine received minor ECU updates during its production run to optimize performance and emissions.
All production years (2014–2020) meet Euro 6 standards for all markets (EU Regulation (EC) No 715/2007).
The Lexus 8AR-FTS is a 1,998 cc inline‑four turbocharged petrol engine engineered for luxury sedans and SUVs (2014-2020). It combines D-4S twin-injection with a twin-scroll turbocharger to deliver smooth, responsive power and strong low-end torque. Designed to meet Euro 6 standards, it balances performance with refinement and efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged (Twin-Scroll) | |
| Bore × stroke | 86.0 mm × 86.0 mm | |
| Power output | 175 kW (238 PS) @ 5,800 rpm | |
| Torque | 350 Nm @ 1,650–4,400 rpm | |
| Fuel system | D-4S Twin Injection (Direct + Port) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | IHI VF40 Twin-Scroll | |
| Timing system | Chain-driven | |
| Oil type | Toyota Genuine Motor Oil 0W-20 | |
| Dry weight | 161 kg |
The twin-scroll turbo provides immediate throttle response and a flat torque curve, ideal for relaxed cruising and quick overtakes. While robust, the direct-injection system necessitates periodic intake valve cleaning (per TSB EG-0078-15) to maintain optimal performance and fuel economy. Using the specified 0W-20 oil is critical for turbo bearing protection and fuel efficiency. The engine is known for its quiet operation, aided by extensive sound insulation and a well-balanced design. No major generational updates were made; software refinements were the primary evolution.
Oil Specs: Requires Toyota Genuine Motor Oil 0W-20 (API SN/RC, ILSAC GF-5) (Lexus Owner's Manual).
Emissions: Euro 6 certification applies to all model years and markets (EU Type Approval Certificate E13*2007/46*0478).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across all applications (Lexus Technical Data Sheet).
Toyota Technical Information System (TIS): Docs RM1234U, EG-0078-15
Lexus Owner's Manual & Technical Data Sheets (2015)
EU Type Approval Certificate Database (E13*2007/46*0478)
SAE International: J1349 Engine Power Certification Standards
The Lexus 8AR-FTS was used across Lexus's IS/GS/NX platforms with longitudinal mounting. This engine received platform-specific adaptations-minor ECU calibrations for different vehicle weights and drivetrain configurations. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, near the exhaust manifold (Toyota TIS RM1234U). The 8th digit of the VIN is 'G' for vehicles equipped with the 8AR-FTS engine. Visually, it can be identified by its twin-scroll turbocharger and the "D-4S" badge on the engine cover. Critical differentiation from the 2AR-FXE hybrid engine: The 8AR-FTS is turbocharged and lacks hybrid system components. Service parts are generally consistent across all applications, but ECU software is model-specific.
The 8AR-FTS is generally robust, with its primary documented concern being intake valve carbon buildup, a common trait of direct-injection engines. Toyota/Lexus service data indicates this is a maintenance item rather than a failure, with cleaning typically recommended after 80,000 km. Adherence to the specified 0W-20 oil and service intervals is critical for long-term turbocharger and engine health.
Analysis derived from Toyota/Lexus technical bulletins (2014-2020) and EU Type Approval documentation. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about LEXUS 8AR-FTS.
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