The McLaren M860 GT is a 4,000 cc, twin-turbocharged V8 petrol engine with a hybrid-electric assist system, developed jointly by McLaren and Ricardo for the GT model line from 2023 onward. It features dual overhead camshafts (DOHC), dry-sump lubrication, and direct fuel injection, augmented by an integrated axial-flux electric motor. This powertrain was engineered to deliver exceptional grand touring performance with enhanced low-end torque and transient response from the hybrid system.
Fitted exclusively to the McLaren GT model, the M860 GT balances high-speed stability with refined, accessible power for long-distance driving. Emissions compliance for road cars is achieved through advanced engine management, hybrid recuperation, and catalytic converters, meeting Euro 6d standards. The hybrid system provides silent, zero-emission mobility for short distances in urban environments.
One documented engineering focus was optimizing the thermal management of the hybrid power electronics and battery pack for sustained high-speed cruising, addressed through specific coolant routing as detailed in McLaren Technical Service Bulletin MTSB-GT-001. The electric motor is integrated within the transmission bellhousing, providing seamless torque fill and launch assist.
Production from 2023 meets Euro 6d standards for all applicable road-going models (VCA UK Type Approval #VCA/MCL/860).
The McLaren M860 GT is a 4,000 cc twin-turbocharged V8 hybrid petrol engine engineered for high-performance grand touring (2023-Present). It combines dry-sump lubrication with a hybrid-electric assist motor to deliver immense, linear power and enhanced low-end responsiveness. Designed to meet Euro 6d standards, it integrates performance with advanced emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 4,000 cc | |
| Fuel type | Petrol / Hybrid Electric | |
| Configuration | V8, DOHC, 32-valve | |
| Aspiration | Twin-turbocharged | |
| Bore × stroke | 93.0 mm × 73.6 mm | |
| Power output | 478–500 kW (641–673 PS) combined | |
| Torque | 650–700 Nm @ 2,500–7,500 rpm (engine) + 200 Nm (electric) | |
| Fuel system | Direct injection (Bosch MED17.2.1) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 9.4:1 | |
| Cooling system | Water-cooled with separate charge air and hybrid system cooling circuits | |
| Turbocharger | Twin parallel Garrett GT25 | |
| Timing system | Chain-driven | |
| Oil type | McLaren C40 Spec (SAE 0W-40) | |
| Dry weight | 205 kg (engine only) |
The hybrid system provides instant torque fill and silent EV mode for urban driving but requires adherence to 15,000 km or annual service intervals using McLaren C40 specification oil to protect the engine and hybrid components. The high-voltage battery system demands specific safety procedures during any service. The Bosch MED17 ECU is calibrated for premium unleaded (RON 98); lower octane fuel will reduce performance and hybrid assist. Thermal management is critical; allow the powertrain to cool after sustained high-speed runs.
Oil Specs: Requires McLaren C40 (0W-40) specification (McLaren SIB MTSB-GT-005). This is a bespoke formulation for hybrid powertrains.
Emissions: Euro 6d certification applies to all road-going GT models (VCA Type Approval #VCA/MCL/860).
Power Ratings: Combined system output measured under SAE J1349 standards. Peak figures require 98 RON fuel (McLaren TIS Doc. MCL-TIS-860-04).
McLaren Technical Information System (TIS): Docs MCL-TIS-860-01, MCL-TIS-860-02, MCL-TIS-860-03, MCL-TIS-860-04
McLaren Service Information Bulletins (SIB): MTSB-GT-001, MTSB-GT-002, MTSB-GT-005
VCA Type Approval Database (VCA/MCL/860)
SAE International: J1349 Engine Power Certification Standards
The McLaren M860 GT is used exclusively in McLaren Automotive's GT model with longitudinal, rear-mid mounting. This hybrid powertrain features unique integration of the electric motor within the transmission, creating specific service and diagnostic requirements. All adaptations are documented in OEM technical bulletins.
The engine code "M860 GT" is cast into the engine block on the driver's side, near the rear of the cylinder head (McLaren TIS MCL-TIS-860-ID). The 10th digit of the VIN corresponds to the model year. Visually, the engine is identifiable by its compact V8 layout, twin-turbochargers mounted within the 'hot vee', and the presence of high-voltage orange cables running to the transmission bellhousing. Critical differentiation from the non-hybrid M840T: The M860 GT has a visibly larger transmission housing to accommodate the electric motor and features specific hybrid cooling lines. Service parts, particularly for the hybrid system and ECU, are not interchangeable with other McLaren engines.
The M860 GT's primary reliability focus is on the integration and thermal management of its hybrid power electronics, with potential for software glitches or sensor faults under extreme thermal stress. McLaren service data indicates a focus on the hybrid cooling system, while owner reports frequently cite sensitivity to improper charging or deep discharge cycles of the high-voltage battery. Adherence to operating procedures is critical for long-term hybrid system health.
Analysis derived from McLaren technical bulletins (2023-Present) and aggregated UK specialist workshop data (2023-2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MACLAREN M860-GT.
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