The Mazda P5X2 is a 2,488 cc, inline‑four naturally aspirated petrol engine produced between 2019 and 2024. It features dual overhead camshafts (DOHC), 16 valves, and Mazda's Skyactiv — G direct injection technology with a high 13.0:1 compression ratio. This engine prioritizes smooth, linear power delivery for its class, producing outputs of 138 kW (187 PS) and 252 Nm of torque.
Fitted primarily to the third — generation Mazda CX — 5 (KF chassis) and Mazda6 (GJFL chassis),…
Mazda
Production years 2019–2021 meet Euro 6d-TEMP standards; 2022–2024 models meet Euro 6d standards depending on market (VCA UK Type Approval #VCA/EMS/8765).
The Mazda P5X2 is a 2,488 cc inline‑four naturally aspirated petrol engine engineered for mid-size SUVs and sedans (2019-2024). It combines Skyactiv-G direct injection with a high geometric compression ratio to deliver smooth, linear power and class-competitive fuel efficiency. Designed to meet stringent Euro 6d-TEMP and Euro 6d standards, it balances responsive performance with low emissions.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,488 cc | |
Fuel type | Petrol | |
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 | Skyactiv-G Direct Injection (13.0:1 CR) | |
Emissions standard | Euro 6d-TEMP (2019-2021); Euro 6d (2022-2024) | |
Compression ratio | 13.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Mazda Genuine 0W-20 | |
Dry weight | Approx. 135 kg |
The Mazda P5X2 was used across Mazda's KF and GJFL platforms with transverse mounting. This engine received platform-specific adaptations-primarily in exhaust routing and engine mount stiffness for the CX-5-but remained fundamentally unchanged throughout its production, ensuring broad parts compatibility. All adaptations are documented in OEM technical bulletins.
The P5X2's primary documented service consideration is potential oil dilution under specific, sustained low-temperature operating conditions. Mazda internal data indicates this is a rare occurrence managed by the vehicle's ECU, while UK DVSA records show no systemic failures linked to this engine. Using the correct low-viscosity oil and allowing the engine to reach full operating temperature are critical for long-term reliability.
Analysis derived from Mazda technical bulletins (2019-2024) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
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Yes, the P5X2 is generally considered a very reliable engine. Its main documented consideration is potential oil dilution under very specific, sustained cold-weather short-trip conditions, which is easily managed. With regular maintenance and using the correct 0W-20 oil, these engines are expected to be trouble-free for well over 200,000 km.
The most commonly discussed item is potential oil dilution in very cold climates with constant short trips, though it's rare. Other typical issues for direct-injection engines include minor carbon buildup on intake valves and occasional VVT solenoid or ignition coil failures. These are well-documented and not typically catastrophic.
The P5X2 2.5L petrol engine was used in the facelifted third-generation Mazda CX-5 (2019-2024) and the final years of the third-generation Mazda6 sedan (2019-2021). It was the larger, naturally aspirated petrol option for these models.
Gains are very limited due to its naturally aspirated, high-compression design. ECU remaps can yield minimal increases (2-5 kW) by optimizing throttle maps and ignition timing, primarily improving drivability. Significant power gains are not feasible without forced induction, which is not a supported modification.
Good for its size. In a CX-5 AWD, expect combined figures of around 7.5-8.0 L/100km (approx. 35-38 mpg UK). The lighter Mazda6 FWD returns slightly better economy, around 7.0-7.5 L/100km (approx. 38-40 mpg UK). Real-world economy is heavily influenced by driving style and conditions.
Yes. The P5X2 is an interference engine. If the timing chain were to fail (which is extremely rare), the pistons would collide with the open valves, causing severe internal engine damage. The timing chain is designed to last the engine's lifetime.
Mazda strongly recommends using their Genuine 0W-20 oil for optimal fuel economy, engine protection, and VVT operation. Using this specific low-viscosity oil is particularly important for managing the engine's thermal characteristics and potential oil dilution.
Comprehensive technical documentation and regulatory references
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MAZDA Official Site
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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)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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