The Mazda PEY5 is a 2,987 cc, naturally aspirated inline‑six petrol engine introduced in 2021 for the brand's premium models. It features a dual overhead camshaft (DOHC) 24‑valve design with cylinder deactivation and electronic fuel injection, producing 209 kW (284 PS). Its smooth, linear power delivery and refined character were engineered for effortless, premium driving dynamics.
Fitted exclusively to the Mazda CX — 60 and CX — 90 SUVs, this engine was designed to off…
Mazda
Production from 2021 meets Euro 6d emissions standards for all markets (VCA UK Type Approval #VCA/EMS/8765).
The Mazda PEY5 is a 2,987 cc inline‑six naturally aspirated petrol engine engineered for premium SUVs (2021-Present). It combines DOHC 24-valve architecture with cylinder deactivation to deliver refined, linear power and enhanced fuel efficiency. Designed to meet stringent Euro 6d emissions standards, it balances performance with environmental responsibility.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,987 cc | |
Fuel type | Petrol | |
Configuration | Inline‑6, DOHC, 24‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 86.0 mm × 85.8 mm | |
Power output | 209 kW (284 PS) @ 6,000 rpm | |
Torque | 350 Nm @ 3,000 rpm | |
Fuel system | Direct Injection with Gasoline Particulate Filter (GPF) | |
Emissions standard | Euro 6d | |
Compression ratio | 13.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | SAE 0W-20 (API SP) | |
Dry weight | 152 kg |
The Mazda PEY5 is used exclusively in Mazda's flagship CX-60 and CX-90 SUVs with longitudinal rear-wheel-drive or all-wheel-drive mounting. This engine received no major platform-specific adaptations during its production run, ensuring full parts interchangeability across all models and model years. All specifications are documented in OEM technical bulletins.
The PEY5's primary reliability consideration is ensuring the longevity of its high-compression combustion system and GPF. Mazda service data indicates very few mechanical failures, while UK DVSA records show minimal engine-related MOT advisories. Infrequent oil changes or use of incorrect fuel can lead to carbon buildup on intake valves or GPF clogging, making adherence to the maintenance schedule and fuel specification critical.
Analysis derived from Mazda technical bulletins (2021-Present) and UK DVSA failure statistics (2023-2024). Repair procedures should follow manufacturer guidelines.
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Based on its design lineage and early data, the PEY5 is expected to be highly reliable. Its naturally aspirated design and robust construction are inherently durable. The main long-term concerns are preventative: managing GPF health and preventing carbon buildup. With proper maintenance and fuel, it should provide many years of trouble-free service.
The most common issues reported are related to its advanced emissions systems: GPF clogging from short trips, carbon buildup on intake valves (a trait of direct injection), and occasional faults in the cylinder deactivation system. Minor oil consumption is considered normal by Mazda.
The PEY5 engine is currently used exclusively in the Mazda CX-60 (from 2022) and CX-90 (from 2023) SUVs. It is paired with Mazda's mild-hybrid 'e-Skyactiv' technology in these applications.
Tuning potential is limited due to its naturally aspirated nature and high factory compression ratio. ECU remaps can yield minor gains (5-15 kW), but significant power increases would require forced induction, which is a complex and expensive modification not commonly performed on this engine.
Official combined figures for the CX-90 are around 8.0-8.5 L/100km (33-35 mpg UK). Real-world consumption is highly dependent on driving style and trip length. Short trips that prevent GPF regeneration will significantly increase fuel usage. Highway cruising yields the best economy.
Yes. The Mazda PEY5 is an interference engine. This means if the timing chain were to fail, the pistons would collide with the open valves, causing severe internal damage. Fortunately, the chain-driven system is very robust and designed to last the life of the vehicle with proper oil maintenance.
Mazda mandates the use of SAE 0W-20 engine oil meeting the latest API SP (or ILSAC GF-6A) specification. This low-viscosity oil is crucial for fuel economy, emissions system function (including GPF), and the operation of the cylinder deactivation system. Using a different viscosity can void the warranty and cause damage.
Comprehensive technical documentation and regulatory references
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MAZDA Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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