The Mazda P5Y1 is a 2,488 cc, inline‑four naturally aspirated petrol engine produced between 2018 and 2023. It features Mazda's Skyactiv — G technology, including direct injection, a 13.0:1 compression ratio, and dual variable valve timing (Dual S — VT). This design prioritizes thermal efficiency and a broad, linear torque curve, delivering 138 kW (187 PS) for responsive performance.
Fitted primarily to the third — generation Mazda CX — 5 (KF) and second — generation Maz…
Mazda
Production years 2018–2020 meet Euro 6d-TEMP standards; 2021–2023 models meet Euro 6d compliance (UK.
The Mazda P5Y1 is a 2,488 cc inline‑four naturally aspirated petrol engine engineered for mid‑size SUVs and sedans (2018-2023). It combines Skyactiv-G direct injection with Dual S-VT variable valve timing to deliver a smooth, powerful driving experience. Designed to meet Euro 6d-TEMP and Euro 6d standards, it balances spirited performance with low emissions.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,488 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 89.0 mm × 100.0 mm | |
Power output | 138 kW (187 PS) @ 6,000 rpm | |
Torque | 252 Nm @ 4,000 rpm | |
Fuel system | Direct Injection (Skyactiv-G) | |
Emissions standard | Euro 6d-TEMP (2018-2020); Euro 6d (2021-2023) | |
Compression ratio | 13.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | N/A | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 128 kg |
The Mazda P5Y1 was used across Mazda's KF/GJ platforms with transverse mounting. This engine received platform-specific adaptations-unique engine mounts and accessory layouts for the CX-5 and Mazda6. All adaptations are documented in OEM technical bulletins.
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The P5Y1's primary documented concern is potential oil dilution under specific, prolonged low-temperature operating conditions, as highlighted in Mazda TSB-005-19. While incidence is low according to internal Mazda quality reports, vehicles subjected to constant short trips in cold climates are most susceptible. Regular longer drives to ensure full engine warm-up are the primary mitigation strategy.
Analysis derived from Mazda technical bulletins (2018-2023) and owner-reported data aggregated from official service channels. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
Yes, the P5Y1 is generally considered a very reliable engine. Its naturally aspirated design and proven Skyactiv-G architecture contribute to longevity. The main consideration is managing the rare potential for oil dilution through driving habits in cold climates. With proper maintenance, these engines are expected to exceed 250,000 km without major issues.
The most frequently documented issues are potential oil dilution (under specific cold-weather conditions), variable valve timing (S-VT) solenoid failures, high-pressure fuel pump (HPFP) faults, and intake manifold runner control (IMRC) actuator failures. These are covered in Mazda's technical service bulletins.
The P5Y1 2.5L Skyactiv-G petrol engine was used in the third-generation Mazda CX-5 (KF chassis, 2018-2023) and the facelifted second-generation Mazda6 (GJ chassis, 2018-2022). It was the standard 2.5L naturally aspirated engine for these models in many markets.
Aftermarket ECU tuning is common on the P5Y1 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Good for its size and power. In a CX-5 AWD, expect combined figures around 7.5-8.0 L/100km (approx. 35-38 mpg UK). The FWD Mazda6 typically returns 6.8-7.2 L/100km (approx. 39-41 mpg UK). Real-world economy is highly dependent on driving style due to the engine's responsiveness.
Yes. The Mazda P5Y1 is an interference engine. If the timing chain were to fail (which is extremely rare as it's designed to last the engine's life), the pistons would collide with the open valves, causing catastrophic internal damage. Fortunately, chain failures are not a common issue with this engine.
Mazda strongly recommends using Mazda Genuine 0W-20 engine oil for optimal fuel economy and performance. This specific low-viscosity oil is crucial for the engine's efficiency and variable valve timing system. Using the correct specification is vital for long-term reliability.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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
Type-approval guidance and documentation.
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