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 fo…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The LFY7 is generally considered a robust and reliable engine. Its main long-term consideration is potential carbon buildup on intake valves, a common trait of direct injection engines. With regular maintenance, use of quality fuel, and potential preventative cleaning, the LFY7 can easily exceed 200,000 km without major issues.
The most frequently cited issues are intake valve carbon buildup causing rough running, occasional noise or failure of the VVT actuator, and leaks from the plastic thermostat housing. High-pressure fuel pump failure is less common but a known potential fault. These are documented in Mazda service information.
The LFY7 2.5L Skyactiv-G petrol engine was used in the second-generation Mazda CX-5 (KF series, 2015-2020) and the third-generation Mazda6 (GJ series, 2015-2020). It was the standard non-turbo petrol engine for these models in many global markets.
Yes, the LFY7 can be tuned. ECU remaps can yield modest gains of 10-15 kW and 20-30 Nm by optimizing ignition and fuel maps. More significant power increases require forced induction (turbo/supercharger kits), which is complex and costly. Bolt-on modifications like intake/exhaust offer minimal gains on this engine.
Official combined figures for the CX-5 2.5L are around 7.4 L/100km (38 mpg UK). Real-world consumption typically ranges from 8.5-10.5 L/100km (27-33 mpg UK) depending heavily on driving style, traffic, and vehicle load. Highway driving can yield figures closer to 6.5 L/100km (43 mpg UK).
Yes. The Mazda LFY7 is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, resulting in severe internal engine damage requiring a costly rebuild or replacement.
Mazda recommends 0W-20 or 5W-30 synthetic engine oil meeting API SN or SM specifications. Using 0W-20 is preferred for optimal fuel economy and cold-weather performance. Always refer to your owner's manual and change the oil at the recommended intervals (typically 10,000 km or 12 months).
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)
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
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VCA Certification Portal
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