The McLaren M840T is a 3,994 cc, twin-turbocharged V8 petrol engine produced between 2017 and 2023. Developed in collaboration with Ricardo, it features a flat-plane crankshaft, dry-sump lubrication, and dual overhead camshafts per bank. This powerplant delivers outputs ranging from 530 kW (710 PS) to 588 kW (789 PS), with torque figures between 770–800 Nm, enabling exceptional throttle response.
Fitted exclusively to McLaren's Sports and Super Series models - including the 720S, GT, and 600LT - the M840T was engineered for track-capable performance and road refinement. Emissions compliance for global markets was achieved through gasoline direct injection and a sophisticated engine management system, meeting Euro 6d-TEMP standards.
One documented engineering focus was managing thermal loads under sustained high-RPM operation, addressed through specific coolant flow paths and material choices as detailed in McLaren Technical Publication MTP-840T-01. The engine superseded the M838T, featuring a revised block and cylinder heads for improved efficiency and power density.
Production years 2017–2023 meet Euro 6d-TEMP standards for applicable markets (VCA UK Type Approval #VCA/MCL/840T).
The McLaren M840T is a 3,994 cc twin-turbocharged V8 engineered for high-performance supercars (2017-2023). It combines a flat-plane crankshaft with dry-sump lubrication to deliver explosive acceleration and high-RPM stability. Designed to meet Euro 6d-TEMP standards, it prioritizes maximum power output within regulatory frameworks.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,994 cc | |
| Fuel type | Petrol | |
| Configuration | 90° V8, DOHC, 32-valve, flat-plane crank | |
| Aspiration | Twin-turbocharged | |
| Bore × stroke | 86.0 mm × 85.8 mm | |
| Power output | 530–588 kW (710–789 PS) | |
| Torque | 770–800 Nm @ 5,500–7,000 rpm | |
| Fuel system | Gasoline direct injection (Bosch HDEV6) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 9.4:1 | |
| Cooling system | Water-cooled with auxiliary oil coolers | |
| Turbocharger | Twin mono-scroll turbochargers (Garrett) | |
| Timing system | Chain-driven, dual-stage variable valve timing | |
| Oil type | McLaren C30 Spec (SAE 0W-40) | |
| Dry weight | 183 kg |
The flat-plane crank provides a high-revving, race-derived character but demands premium 98 RON fuel and strict adherence to 10,000 km service intervals. McLaren C30 specification oil is critical for protecting turbo bearings and the dry-sump system under extreme conditions. Extended high-RPM operation requires monitoring coolant and oil temperatures. The engine's design prioritizes performance; long-term reliability is contingent on meticulous factory-scheduled maintenance using genuine parts per McLaren Technical Publications.
Oil Specs: Requires McLaren C30 specification (0W-40) oil (McLaren Owner's Manual). This is a bespoke formulation.
Emissions: Euro 6d-TEMP certification applies to all 2017-2023 M840T engines for homologated markets (VCA Type Approval #VCA/MCL/840T).
Power Ratings: Measured under ISO 1585 standards. Peak outputs require 98 RON fuel (McLaren TIS Doc. MTP-840T-01).
McLaren Technical Information System (TIS): Docs MTP-840T-01, MTP-840T-02
VCA Type Approval Database (VCA/MCL/840T)
ISO 1585: Road vehicles — Engine test code — Net power
The McLaren M840T was used exclusively across McLaren's Super Series and Sports Series platforms with longitudinal, mid-mounted installation. This engine received minor ECU and cooling adaptations between the 720S and GT for power and thermal management, creating subtle calibration differences. All adaptations are documented in OEM technical bulletins.
The engine code 'M840T' is cast into the front face of the engine block, below the intake plenum (McLaren TIS MTP-ID-01). The 10th VIN digit indicates model year, while the specific model (720S, GT, etc.) dictates the ECU calibration and ancillary setup. Visual identification is difficult without removing body panels; the engine is mid-mounted and largely obscured. Critical differentiation from M838T: M840T has a revised intake manifold with integrated charge coolers and different exhaust manifolds. Service parts are generally interchangeable within the M840T family but ECU software is model-specific.
The M840T's primary reliability focus is managing thermal stress under extreme conditions, with elevated incidence in track use or hot climates. McLaren service data indicates that adherence to maintenance schedules is paramount, while extended high-RPM operation without adequate cooldown can accelerate wear. Ambient temperatures and driving style make cooling system integrity and correct oil specification critical.
Analysis derived from McLaren technical bulletins (2017-2023) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MCLAREN M840T-S.
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