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 Mazda6 (GJ), the P5Y1 was engineered for drivers seeking a refined, powerful, and economical driving experience. Emissions compliance was achieved through precise combustion control and a sophisticated exhaust aftertreatment system, meeting stringent Euro 6d-TEMP and Euro 6d standards.
One documented area for attention is potential oil dilution under specific, prolonged low-temperature operating conditions, as noted in Mazda Technical Service Bulletin TSB-005-19. This phenomenon, while rare, is linked to the engine's high compression and direct injection strategy during extended cold starts and short trips.
Mazda
Production years 2018–2020 meet Euro 6d-TEMP standards; 2021–2023 models meet Euro 6d compliance (UK VCA Type Approval #VCA/MZ/8910).
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 | Mazda Genuine 0W-20 (API SP) | |
| Dry weight | 128 kg |
The high compression ratio and direct injection provide excellent fuel economy and strong mid-range torque, ideal for highway cruising and overtaking. Mazda Genuine 0W-20 oil is critical for maintaining fuel efficiency and protecting components under high compression. The timing chain is designed for the engine's lifetime. To mitigate the rare risk of oil dilution noted in TSB-005-19, avoid prolonged idling and very short trips in consistently cold climates; occasional longer drives help the engine reach optimal operating temperature.
Oil Specs: Requires Mazda Genuine 0W-20 meeting API SP (Mazda Owner's Manual). Essential for fuel economy and engine protection under high compression.
Emissions: Euro 6d-TEMP certification applies to 2018-2020 models; Euro 6d applies to 2021-2023 models (VCA Type Approval #VCA/MZ/8910).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across specified fuel grades (Mazda TIS Doc. JW02-01-001).
Mazda Technical Information System (TIS): Docs JW02, TSB-005-19
VCA Type Approval Database (VCA/MZ/8910)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped on the front of the engine block, near the exhaust manifold (Mazda TIS JW02-01-001). The 8th digit of the VIN is 'P' for vehicles equipped with the 2.5L Skyactiv-G petrol engine. Visually, the engine features a black plastic engine cover with "SKYACTIV-G" branding. Critical differentiation from the PY-VPS engine: The P5Y1 is naturally aspirated; the PY-VPS is turbocharged. Service parts are generally interchangeable within the same model year range, but ECU software versions differ.
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.
Find answers to most commonly asked questions about MAZDA P5Y1.
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