The Mazda LFY7 is a 2,488 cc, inline‑four naturally aspirated petrol engine produced between 2015 and 2020. It features dual overhead camshafts (DOHC), 16 valves, and Mazda's Skyactiv-G direct injection technology. This architecture prioritizes thermal efficiency, delivering a balance of 140 kW (190 PS) and 252 Nm for responsive, everyday drivability.
Fitted primarily to the second-generation CX-5 (KF) and third-generation Mazda6 (GJ), the LFY7 was engineered for refined cruising and linear power delivery. Emissions compliance for European markets was achieved through optimized combustion and a close-coupled catalytic converter, meeting Euro 6 standards.
One documented service concern involves potential carbon buildup on intake valves, a known characteristic of direct injection engines. Mazda Service Bulletin 01-009/18 outlines inspection procedures for affected vehicles exhibiting rough idle or hesitation. No major generational hardware updates occurred during its production run.
Mazda
Production years 2015–2020 meet Euro 6 standards for relevant markets (VCA UK Type Approval #VCA/MZ/5678).
The Mazda LFY7 is a 2,488 cc inline‑four naturally aspirated petrol engine engineered for mid‑size SUVs and sedans (2015-2020). It combines Skyactiv-G direct injection with a high 13.0:1 compression ratio to deliver linear power and enhanced fuel efficiency. Designed to meet Euro 6 standards, it balances spirited 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 | 140 kW (190 PS) @ 6,000 rpm | |
| Torque | 252 Nm @ 4,000 rpm | |
| Fuel system | Direct Injection (Skyactiv-G) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 13.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | Mazda Genuine 0W-20 or 5W-30 (API SN/SM) | |
| Dry weight | Not Publicly Available |
The high compression ratio and direct injection provide strong mid-range torque and efficiency but can lead to intake valve carbon deposits over time, potentially causing rough idle or hesitation. Using Top Tier detergent petrol and adhering to the 10,000 km or 12-month oil change interval is critical. The chain-driven timing system is designed for longevity, typically requiring no scheduled replacement. Valve cleaning may be necessary as preventative maintenance around 80,000–100,000 km per service recommendations.
Oil Specs: Requires Mazda Genuine 0W-20 or 5W-30 meeting API SN/SM (Mazda Owner's Manual). Lower viscosity aids cold-start efficiency.
Emissions: Euro 6 certification applies to all LFY7 engines in this production period (VCA Type Approval #VCA/MZ/5678).
Power Ratings: Measured under SAE J1349 standards. Output figures are consistent across specified model applications (Mazda Group PT-2020).
Mazda Technical Information System: ETK Doc. MZ-ETK-2488, SIB 01-009/18
VCA Type Approval Database (VCA/MZ/5678)
SAE International: J1349 Engine Power Certification Standards
The Mazda LFY7 was used across Mazda's KF/GJ platforms with transverse mounting and no external licensing. This engine received minor ECU calibration updates for model year changes but no major hardware revisions affecting core compatibility. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a metal plate affixed to the cylinder head, near the ignition coils (Mazda ETK Doc. MZ-ETK-2488). The 8th digit of the VIN is 'Y' for the 2.5L Skyactiv-G petrol engine. Visually, the engine features a black plastic cover with "SKYACTIV-G 2.5" branding. Differentiation from the turbocharged LFV engine: LFY7 lacks a turbocharger, intercooler, and associated piping. Service parts for the LFY7 are generally consistent across its production run, but ECU software versions should be verified for specific model years.
The LFY7's primary documented concern is intake valve carbon buildup, with elevated incidence in vehicles subjected to frequent short trips. Mazda internal service data indicates this is a common maintenance item rather than a failure, while owner feedback often cites it as a cause for drivability complaints. Regular use of quality fuel and adherence to service intervals make preventative cleaning a manageable task.
Analysis derived from Mazda technical bulletins (2015-2020) and aggregated owner-reported data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA LFY7.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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