The Mazda FS is a 1,991 cc, inline‑four naturally aspirated petrol engine produced between 1998 and 2008. It features a dual overhead camshaft (DOHC) with four valves per cylinder and an aluminium block and head for reduced weight. In standard form, it delivered approximately 92–105 kW (125–143 PS), providing a balance of efficiency and spirited performance for its class.
Fitted to models such as the 626 (GF platform), MX — 5 (NB), and Premacy (CP platform), the FS was engin…
Mazda
Production years 1998–2005 meet Euro 3 standards; 2006–2008 models meet Euro 4 standards depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Mazda FS is a 1,991 cc inline‑four naturally aspirated petrol engine engineered for compact and sports cars (1998-2008). It combines an aluminium block with a DOHC 16-valve head and variable intake geometry to deliver responsive, linear power. Designed to meet Euro 3 and Euro 4 emissions standards, it balances performance with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,991 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 83.0 mm × 92.0 mm | |
Power output | 92–105 kW (125–143 PS) | |
Torque | 170–180 Nm @ 4,000–5,000 rpm | |
Fuel system | Sequential multi-port fuel injection (SFI) | |
Emissions standard | Euro 3 (1998–2005); Euro 4 (2006–2008) | |
Compression ratio | 9.7:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | SAE 5W-30 (API SJ/SL) | |
Dry weight | Not specified in available OEM documentation |
The Mazda FS was used across Mazda's GF/NB platforms with longitudinal mounting. This engine received platform-specific adaptations-different intake manifolds for the 626 versus the MX-5-and from 2001 the facelifted 626 models received minor ECU and VICS updates. All adaptations are documented in OEM technical bulletins.
The FS's primary reliability risk is oil consumption in high-mileage units, with elevated incidence in engines subjected to frequent short trips. Mazda service bulletins indicate this was a common cause for customer complaints in the early 2000s, while general owner feedback highlights the importance of regular oil changes. Extended oil change intervals and use of incorrect viscosity oil make adherence to the specified 5W-30 grade critical.
Analysis derived from Mazda technical bulletins (1998-2008) and owner workshop manual guidance. 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 FS is generally a robust and well-regarded engine. Its primary long-term concern is oil consumption in high-mileage units, which can be managed with proper maintenance. With regular oil changes using the correct 5W-30 oil, these engines can reliably exceed 250,000 km. Ignition coil failures are common but inexpensive to fix.
The most frequent issues are excessive oil consumption (piston rings/valve seals), ignition coil failures, and VICS system faults. Cooling system leaks from the water pump or thermostat housing are also common as the engine ages. These are well-documented in service manuals and technical bulletins.
The FS engine was used in several popular models, including the 626 (GF, 1998-2002), MX-5 Miata (NB, 1998-2005), Premacy (CP, 1999-2004), and Familia/323 (BJ, 1998-2003). The higher-performance FS-ZE variant was exclusive to the 1.8L MX-5.
Yes, the FS responds well to basic tuning. Simple upgrades like a free-flow exhaust, cold air intake, and ECU remap can yield modest gains. The FS-ZE in the MX-5 is particularly tunable. More significant power increases require internal modifications like cams or forced induction, which are more complex.
Fuel economy is reasonable for its era. Expect around 9.5-11.0 L/100km (25-28 mpg UK) in city driving and 6.5-7.5 L/100km (38-43 mpg UK) on the highway for a typical 626 sedan. The lighter MX-5 is slightly more efficient. Real-world figures vary with driving style and condition.
Yes. The Mazda FS is an interference engine. If the timing chain were to fail or jump timing, the pistons and valves will collide, causing severe internal engine damage. Fortunately, the chain is very durable and rarely fails if basic maintenance is followed.
Mazda specified SAE 5W-30 engine oil meeting API SJ/SL standards. Using a high-quality synthetic or semi-synthetic oil of this grade is recommended, especially for high-mileage engines, to help reduce oil consumption and protect against sludge. Change intervals should be 10,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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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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