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 engineered for responsive, refined driving. Emissions compliance for its production period was met through sequential multi-port fuel injection and variable intake systems, aligning with Euro 3 and Japanese 2000 emissions standards.
One documented reliability concern is oil consumption in high-mileage units, often linked to wear of the piston rings or valve stem seals, as noted in Mazda Service Bulletin 01‑005/08. This issue can lead to increased oil usage and blue exhaust smoke. Later production runs incorporated revised piston ring designs to mitigate this.
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 DOHC 16-valve design offers good high-RPM power but requires adherence to 10,000 km oil change intervals to prevent sludge buildup and premature wear. Using the specified SAE 5W-30 oil is critical for optimal lubrication and fuel economy. The timing chain is generally maintenance-free but should be inspected for noise after 150,000 km. High-mileage engines may exhibit oil consumption; inspecting and replacing valve stem seals or piston rings per Mazda SIB 01-005/08 is the recommended corrective action.
Oil Specs: Requires SAE 5W-30 meeting API SJ/SL specification (Mazda Owner's Manual, 2002).
Emissions: Euro 3 certification applies to 1998–2005 models; Euro 4 for 2006–2008 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under JIS D 1001 standards for Japanese market; European figures may vary slightly (Mazda European Sales Brochure, 2000).
Mazda Workshop Manual (Publication No. 0597-94-8302)
Mazda Owner's Manual (Various Models, 2002)
VCA Type Approval Database (VCA/EMS/5678)
Mazda European Sales Brochure (2000)
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.
Locate the engine code stamped on a flat pad on the front of the cylinder block, just below the cylinder head and to the right of the water pump (Mazda Workshop Manual 0597-94-8302). The code will read "FS" followed by a suffix (e.g., FS-DE, FS-ZE). Visual identification: The aluminium block and DOHC valve cover with "16 Valve" marking distinguish it from the iron-block FE engine. The FS-ZE in the MX-5 has a distinctive red valve cover and higher-lift camshafts.
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.
Find answers to most commonly asked questions about MAZDA FS.
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