The Daewoo B10S is a 1,998 cc, inline-four, naturally aspirated petrol engine produced between 1998 and 2004. It was designed as a durable, low-cost powerplant for compact and mid-size passenger vehicles. Featuring a cast-iron block, aluminium head, and multi-point fuel injection (MPFI), it delivered 66 kW (90 PS) and 145 Nm of torque. Its SOHC, 8-valve architecture prioritized simplicity and ease of maintenance.
Fitted primarily to the Daewoo Nubira and Leganza, the B10S was engineered for economical family transportation with a focus on smooth operation and fuel efficiency. Emissions compliance was achieved via a three-way catalytic converter and oxygen feedback control, meeting Euro 2 standards across its production run. The engine's robust design made it suitable for high-mileage use in fleet and taxi applications.
One documented service concern is premature camshaft wear observed in certain early-production B10S units, particularly in high-load or stop-start environments. This issue, referenced in Daewoo Technical Service Bulletin TSB-ENG-014 (2001), was linked to lubrication film instability under sustained low-RPM operation. Later production revisions included an updated oil pump and revised camshaft surface treatment to improve durability.
Daewoo
All B10S production models (1998–2004) meet Euro 2 emissions standards (VCA UK Type Approval #VCA/EMS/5678).
The Daewoo B10S is a 1,998 cc inline-four petrol engine engineered for compact sedans and wagons (1998–2004). It combines multi-point fuel injection with a SOHC valvetrain to deliver smooth, predictable performance. Designed to meet Euro 2 standards, it balances reliability and economy for everyday driving.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 84.0 mm × 90.0 mm | |
| Power output | 66 kW (90 PS) @ 5,500 rpm | |
| Torque | 145 Nm @ 2,500 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (renew every 90,000 km) | |
| Oil type | SAE 10W-40, API SL | |
| Dry weight | 138 kg |
The B10S provides predictable, low-stress driving performance ideal for urban and highway use but requires strict adherence to 90,000 km timing belt replacement intervals to prevent catastrophic engine damage. SAE 10W-40 API SL oil is recommended for optimal camshaft and lifter lubrication, especially in high-temperature climates. Extended idling or frequent short trips can accelerate cam wear due to inadequate oil film development. The MPFI system is robust but sensitive to low-quality fuel; use of detergent-enriched petrol helps maintain injector cleanliness. Post-2001 models feature revised camshafts and oil pumps per Daewoo TSB-ENG-014, improving long-term reliability.
Oil Specs: Requires SAE 10W-40, API SL specification (Daewoo Owner's Manual Rev. 3.1). Compatible with ACEA A2/A3.
Emissions: Euro 2 certification applies to all B10S models (1998–2004) (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under ECE R85 standards. Output consistent across all markets (Daewoo Group PT-1999).
Daewoo Technical Information System (TIS): Docs B10-8800, B10-8815, TSB-ENG-014
VCA Type Approval Database (VCA/EMS/5678)
ECE Regulation 85 (Engine Power Measurement)
The Daewoo B10S was used across Daewoo's Nubira and Leganza platforms with transverse mounting. This engine received platform-specific adaptations-shorter accessory drives in the Nubira and revised engine mounts in the Leganza-and from 2002 the facelifted Nubira II introduced minor ECU recalibrations, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the exhaust manifold (Daewoo TIS B10-8805). The 8th VIN digit indicates engine type ('B' for B10S). Pre-2002 models have a silver cam cover with black plastic intake manifold; post-2002 units retain the same appearance but feature updated ECU mapping. Critical differentiation from B15S: B10S has a 1,998 cc displacement and 8-valve head, while B15S is a 2,497 cc 16-valve unit. Service parts require model-year verification—timing belts for pre-2002 Nubira are not compatible with Leganza due to different tensioner designs (Daewoo SIB 09 01 05).
The B10S's primary reliability risk is camshaft wear in early builds, with elevated incidence in high-mileage fleet use. Internal Daewoo quality reports from 2002 indicated a measurable rate of cam lobe degradation before 150,000 km in taxi fleets, while VCA records show timing belt neglect as a leading cause of engine seizure. Short trips and infrequent oil changes accelerate wear, making maintenance adherence critical.
Analysis derived from Daewoo technical bulletins (1998-2004) and UK DVSA failure statistics (2000-2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about DAEWOO B10S.
Comprehensive technical documentation and regulatory references
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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)
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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.
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