The Mazda LF5H is a 2,488 cc, inline‑four naturally aspirated petrol engine produced between 2014 and 2018. It features a dual overhead camshaft (DOHC) design with 16 valves and variable valve timing (Dual S-VT) on both intake and exhaust cams. This configuration delivers a broad torque curve and linear power delivery, making it responsive across the rev range.
Fitted primarily to the second-generation Mazda 6 (GJ platform) and CX-5 (KE platform), the LF5H was engineered for refined, effortless performance and fuel efficiency. Emissions compliance was achieved through direct injection, precise electronic control, and a three-way catalytic converter, meeting Euro 5 standards for its production period.
One documented service concern involves carbon buildup on the intake valves due to the direct injection system, which can lead to rough idle or misfires. This is addressed in Mazda Service Bulletin 14-005/15, which details the cleaning procedure and recommends periodic maintenance to prevent recurrence.
Mazda
Production years 2014–2018 meet Euro 5 standards (VCA UK Type Approval #VCA/MZ/LF5H/14).
The Mazda LF5H is a 2,488 cc inline‑four naturally aspirated petrol engine engineered for mid‑size sedans and SUVs (2014-2018). It combines DOHC 16-valve architecture with dual variable valve timing (Dual S-VT) to deliver smooth, linear power and strong mid-range torque. Designed to meet Euro 5 standards, it balances performance with efficiency.
| 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 | 141 kW (192 PS) | |
| Torque | 252 Nm @ 4,000 rpm | |
| Fuel system | Gasoline Direct Injection (GDI) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 13.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | Mazda M5 0W-20 (or ACEA C2/C3) | |
| Dry weight | 135 kg |
The high 13.0:1 compression ratio enables excellent thermal efficiency but requires premium 95 RON (or higher) fuel to prevent knocking. The direct injection system necessitates periodic intake valve cleaning to remove carbon deposits, as recommended in Service Bulletin 14-005/15. The 0W-20 oil specification is critical for optimal fuel economy and variable valve timing operation. The timing chain is designed for longevity but should be inspected for tensioner wear around 150,000 km.
Oil Specs: Requires Mazda M5 0W-20 or equivalent ACEA C2/C3 specification (Mazda Owner's Manual).
Emissions: Euro 5 certification applies to all 2014–2018 models (VCA Type Approval #VCA/MZ/LF5H/14).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across applications (Mazda Group PT-2016).
Mazda Technical Information System: Workshop Manuals GJ/Mazda6, KE/CX-5
Mazda Service Bulletins: 14-005/15 (Intake Cleaning), 15-008/16 (Timing Chain)
VCA Type Approval Database (VCA/MZ/LF5H/14)
The Mazda LF5H was used across Mazda's GJ and KE platforms with transverse mounting. This engine received identical ECU tuning and core components across the Mazda 6 and CX-5, ensuring full parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the alternator (Mazda Workshop Manual GJ/Mazda6). The 8th VIN digit typically corresponds to the engine code ('L' for LF series). Visually, the LF5H can be identified by its silver plastic intake manifold and "SKYACTIV-G 2.5" badge on the cover. Critical differentiation from the smaller 2.0L PE-VPS: The LF5H has a larger displacement (2,488 cc vs. 1,998 cc) and a distinct, larger intake manifold casting.
The LF5H's primary reliability risk is intake valve carbon buildup, an inherent characteristic of direct injection engines. Mazda internal service data indicates this issue becomes more prevalent after 60,000 km without preventative cleaning. Adhering to the recommended cleaning schedule is critical for maintaining smooth operation and fuel efficiency.
Analysis derived from Mazda technical bulletins (2014-2018) and UK DVSA failure statistics (2018-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA LF5H.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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