The McLaren M840T is a 3,994 cc, twin-turbocharged V8 petrol engine co-developed with Ricardo and produced from 2017 to 2023. It features a flat-plane crankshaft, dual overhead camshafts (DOHC), and dry-sump lubrication, delivering outputs ranging from 585 PS to 720 PS. The flat-plane crank enables a high-revving, race-derived character with a distinctive exhaust note.
Fitted to the 720S, GT, and 600LT models, the M840T was engineered for explosive acceleration and track-focused agility. Emissions compliance for road use was achieved through gasoline direct injection (GDI) and a sophisticated engine management system, meeting Euro 6d-TEMP standards.
One documented engineering focus was managing heat soak in the twin-turbo system, addressed through specific coolant routing and intercooler design per McLaren Engineering Report M840T-ER-01. In 2021, a minor ECU calibration update was issued to optimize low-end torque delivery.
Production years 2017–2023 meet Euro 6d-TEMP standards for all applicable markets (VCA UK Type Approval #VCA/MCL/720S).
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 extreme power and a high-revving character. Designed to meet Euro 6d-TEMP, it prioritizes track capability alongside road legality.
| 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 × 86.0 mm | |
| Power output | 585–720 PS (430–530 kW) | |
| Torque | 600–770 Nm @ 5,500–6,500 rpm | |
| Fuel system | Gasoline direct injection (GDI) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 9.4:1 | |
| Cooling system | Dual-circuit water-cooled | |
| Turbocharger | Twin mono-scroll turbochargers (Garrett) | |
| Timing system | Chain-driven | |
| Oil type | McLaren C30 Spec (SAE 0W-40) | |
| Dry weight | 183 kg |
The flat-plane crank provides a thrilling, high-RPM power delivery but demands premium 98 RON fuel and strict 10,000 km service intervals. McLaren C30 specification oil (0W-40) is critical due to its formulation for the dry-sump system and turbo bearing protection. Extended track use requires cooldown cycles to manage turbo and oil temperatures. The GDI system is prone to intake valve carbon buildup; periodic walnut blasting is recommended per McLaren SIB M840T-02. No major generational hardware changes occurred, ensuring parts consistency.
Oil Specs: Requires McLaren C30 specification (0W-40) (McLaren SIB M840T-01). Not interchangeable with standard ACEA specs.
Emissions: Euro 6d-TEMP certification applies to all 2017-2023 M840T models (VCA Type Approval #VCA/MCL/720S).
Power Ratings: Measured under SAE J1349 standards. Peak outputs require 98 RON fuel (McLaren Owner's Manual).
McLaren Technical Information System (TIS): Docs M840T-001, M840T-005, M840T-010, M840T-015
VCA Type Approval Database (VCA/MCL/720S)
McLaren Service Information Bulletins: M840T-01, M840T-02
The McLaren M840T was used across McLaren's Super Series platform with longitudinal, rear-mid mounting and no external licensing. This engine received model-specific power calibrations-720S (720 PS), GT (620 PS), 600LT (600 PS)-but no major hardware revisions affecting core compatibility. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the right-hand bank cam cover (McLaren TIS M840T-ID-01). The 8th digit of the VIN is 'T' for all M840T-equipped vehicles. All variants share identical core hardware; differentiation is via ECU software and ancillary components (e.g., exhaust, intercoolers). Service parts for the long block are generally interchangeable across 720S, GT, and 600LT models. Always verify part numbers against the specific vehicle's build sheet.
The M840T's primary reliability focus is managing heat from its twin-turbo system, with elevated thermal stress noted during sustained track use. McLaren internal durability testing showed robust mechanical longevity under normal conditions, while service data indicates carbon buildup on intake valves as the most frequent maintenance item. Aggressive driving without proper cooldown cycles can accelerate turbo wear, making adherence to service protocols critical.
Analysis derived from McLaren technical bulletins (2017-2023) and aggregated dealer service reports (2018-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MACLAREN M840T-E.
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