The Mazda LFG8 is a 2,488 cc, inline‑four naturally aspirated petrol engine produced between 2016 and 2021. It belongs to Mazda’s Skyactiv‑G family and features direct fuel injection (DISI), dual overhead camshafts (DOHC), and a high 13.0:1 compression ratio for improved thermal efficiency. Output ranges from 140–142 kW (190–192 PS) with torque between 252–258 Nm, optimized for linear throttle response and fuel economy.
Fitted to models such as the Mazda6 (GJ), CX‑5 (…
Mazda
All production years (2016–2021) meet Euro 6b standards (VCA UK Type Approval #VCA/SKY/7890).
The Mazda LFG8 is a 2,488 cc inline‑four naturally aspirated petrol engine engineered for midsize sedans and SUVs (2016–2021). It combines direct injection (DISI) with a high-compression design to deliver smooth power and improved fuel efficiency. Designed to meet Euro 6b emissions standards, it integrates cooled EGR and precise combustion control for urban air quality compliance.
| 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 | 140–142 kW (190–192 PS) | |
Torque | 252–258 Nm @ 4,000 rpm | |
Fuel system | Denso DISI direct injection (up to 200 bar) | |
Emissions standard | Euro 6b | |
Compression ratio | 13.0:1 | |
Cooling system | Water‑cooled with dual‑thermostat layout | |
Turbocharger | None | |
Timing system | Chain (front‑mounted, maintenance‑free design) | |
Oil type | Mazda M5 0W‑20 (API SN/ILSAC GF‑5) | |
Dry weight | 142 kg |
The Mazda LFG8 was used across Mazda's GJ/KF platforms with transverse mounting. This engine received platform-specific cooling and mount tuning—enhanced radiator capacity in the CX‑5 and revised engine mounts in the Mazda6—and from mid-2019 incorporated updated HPFP components per SIB 01‑007/19, creating minor service part interchange limits. All adaptations are documented in OEM technical bulletins.
The LFG8's primary reliability risk is high-pressure fuel pump wear in early builds, with elevated incidence in frequent short-trip usage. Mazda internal data indicated a modest increase in HPFP warranty claims for pre‑mid‑2019 units, while UK DVSA records show low emissions-related failures thanks to robust EGR and lambda control. Urban driving and incorrect oil use can exacerbate wear, making adherence to Mazda M5 0W‑20 specifications and fuel quality critical.
Analysis derived from Mazda technical bulletins (2016–2021) and UK DVSA failure statistics (2018–2024). Repair procedures should follow manufacturer guidelines.
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Generally yes. The LFG8 is a robust naturally aspirated engine with few major issues. Early units (2016–mid-2019) may experience HPFP wear under harsh conditions, but this was addressed by Mazda. With correct oil (Mazda M5 0W‑20) and quality fuel, it offers excellent longevity and smooth performance.
Top issues include HPFP wear (early builds), mild carbon buildup on intake valves, coolant housing leaks, and VVT sluggishness from incorrect oil. All are manageable with proper maintenance and are documented in Mazda service bulletins.
The LFG8 appears in the Mazda6 GJ (2016–2021), CX‑5 KF (2017–2021), and CX‑8 KJ (2018–2021) as the 2.5 S or Signature variants. It’s a naturally aspirated Skyactiv‑G engine and should not be confused with the turbocharged PY‑VPS used in later models.
Limited potential due to high static compression (13.0:1). Minor ECU tweaks may yield +5–8 kW, but significant gains require forced induction, which risks knock without major internal changes. Most owners retain stock tuning for reliability and fuel economy.
In a Mazda6 2.5 S, expect ~8.2 L/100km city and ~5.9 L/100km highway, or ~40 mpg UK combined. Real-world figures range 36–44 mpg (UK) depending on driving style. Highway efficiency is strong thanks to the high-compression design and 6-speed automatic.
Yes. Like all modern Mazda petrol engines, the LFG8 is an interference design. If the timing chain fails (extremely rare), valve-to-piston contact can occur. However, the chain is front-mounted and designed for life-of-engine use with proper oil maintenance.
Mazda specifies M5 0W‑20 synthetic oil meeting API SN/ILSAC GF‑5 and OEM M5 approval. Never use non-approved 0W‑20 oils, as they lack additives for VVT and HPFP protection. Change intervals should not exceed 15,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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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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