The Mazda B6DA is a 1,598 cc, inline‑four naturally aspirated petrol engine produced between 2002 and 2008. It features a dual overhead camshaft (DOHC) design with 16 valves and Mazda's S-VT (Sequential Valve Timing) system. This technology optimizes valve overlap for improved low-end torque and overall fuel efficiency across the rev range.
Fitted primarily to the BJ-generation Mazda2/Demio and some regional variants of the Mazda3/Axela, the B6DA was engineered for responsive city driving and economical commuting. Emissions compliance for its production run was achieved through precise electronic fuel injection and a three-way catalytic converter, meeting Euro 3 standards.
One documented service concern is potential wear in the S-VT actuator mechanism, which can lead to timing inaccuracies or fault codes. This issue, referenced in Mazda Service Bulletin E01‑02‑08, is often linked to infrequent oil changes or the use of incorrect viscosity. Later production runs incorporated minor revisions to the actuator design for improved durability.
Mazda
Production years 2002–2008 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5678).
The Mazda B6DA is a 1,598 cc inline‑four naturally aspirated petrol engine engineered for subcompact and compact hatchbacks (2002-2008). It combines DOHC 16-valve architecture with S-VT variable valve timing to deliver responsive low-end power and efficient cruising. Designed to meet Euro 3 standards, it balances urban agility with fuel economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 78.0 mm × 83.6 mm | |
| Power output | 77–88 kW (105–120 PS) | |
| Torque | 140–150 Nm @ 4,000 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 9.7:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | SAE 5W‑30 (API SL/SM) | |
| Dry weight | 108 kg |
The S-VT system provides a broad, usable torque curve ideal for stop-start traffic but requires strict adherence to 10,000 km or 12-month oil change intervals to prevent actuator wear. Using the specified 5W-30 oil is critical due to its role in lubricating the variable timing mechanism. The chain-driven timing system is generally robust but should be inspected for tension and noise during major services. Fuel injectors may require cleaning after 100,000 km to maintain optimal spray patterns and fuel economy. No major generational updates occurred during its production run.
Oil Specs: Requires SAE 5W-30 meeting API SL/SM specification (Mazda Owner's Manual BJ-2003).
Emissions: Euro 3 certification applies to all 2002–2008 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. Output varies by model application and ECU tuning (Mazda TIS Doc. B6-001).
Mazda Technical Information System (TIS): Docs BJ-2003, B6-001, E01-02-08
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Mazda B6DA was used across Mazda's BJ platform with transverse mounting. This engine received minor ECU calibration adaptations for different global markets and trim levels, creating no significant interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front of the cylinder block, below the exhaust manifold (Mazda TIS B6-002). The 8th VIN digit typically corresponds to the engine type ('6' for B6 series). The B6DA is visually identified by its black plastic intake manifold and the "S-VT" logo on the camshaft cover. Critical differentiation from the non-SVT B6: B6DA has an additional solenoid and actuator on the intake camshaft sprocket. Engine mounts and some ancillary brackets are specific to the vehicle model and are not always interchangeable.
The B6DA's primary reliability consideration is S-VT actuator wear, with elevated incidence in vehicles subjected to infrequent servicing or incorrect oil. Mazda service data indicates a correlation between neglected oil changes and actuator failures, while timing chains are generally robust. Maintaining correct oil specification and interval is critical for long-term actuator health.
Analysis derived from Mazda technical bulletins (2003-2008) and general industry repair data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA B6DA.
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DVLA: Engine Changes & MoT
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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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GOV.UK: Vehicle Approval
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