The Daewoo A16XHT is a 1,598 cc, inline-four, naturally aspirated petrol engine produced between 2000 and 2008. It was developed as part of the GM Family 1 engine series and features multi-point fuel injection (MPFI), a cast-iron block, and aluminium cylinder head. With a peak output of 85 kW (116 PS) and 150 Nm of torque, it delivers reliable performance suitable for compact passenger vehicles.
Fitted to models such as the Daewoo Nubira, Daewoo Lacetti, and Chevrolet Optra, the A16XHT was engineered for economical daily commuting and dependable city driving. Emissions compliance was achieved through a three-way catalytic converter and oxygen sensor feedback, allowing it to meet Euro 3 standards across most European markets during its production run.
One documented service concern involves premature wear of the timing belt tensioner, which can lead to belt slippage or failure. This issue, referenced in Daewoo Service Information Bulletin DSB-04-015, is typically associated with delayed maintenance intervals. In 2005, revised tensioner components were introduced across the Lacetti production line to improve long-term reliability.
Daewoo
Production years 2000–2005 meet Euro 3 standards; 2006–2008 models comply with Euro 4 (VCA UK Type Approval #VCA/EMS/5678).
The Daewoo A16XHT is a 1,598 cc inline-four petrol engine engineered for compact sedans and hatchbacks (2000-2008). It combines multi-point fuel injection with a dual overhead camshaft (DOHC) valvetrain to deliver smooth daily driving performance. Designed to meet Euro 3 and later Euro 4 emissions standards, it balances fuel economy with dependable drivability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol (Unleaded, 95 RON) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 79.0 mm × 81.5 mm | |
| Power output | 85 kW (116 PS) @ 5,800 rpm | |
| Torque | 150 Nm @ 4,000 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | Euro 3 (2000–2005); Euro 4 (2006–2008) | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Rubber timing belt (interval: 90,000 km) | |
| Oil type | SAE 5W-30 (API SL/CF) | |
| Dry weight | 128 kg |
The naturally aspirated design provides predictable throttle response ideal for city driving but requires strict adherence to 90,000 km timing belt replacement intervals to prevent valve train damage. SAE 5W-30 oil meeting API SL/CF standards is essential for maintaining hydraulic lifter performance and reducing camshaft wear. Use of low-octane fuel can lead to knock under load due to the 10.5:1 compression ratio. The MPFI system is robust but sensitive to clogged injectors if low-quality fuel is used regularly. Post-2005 models feature an upgraded tensioner design; pre-2005 units should be inspected for wear per Daewoo SIB DSB-04-015. Catalytic converter longevity depends on consistent air-fuel mixture control and avoidance of oil burning.
Oil Specs: Requires SAE 5W-30 (API SL/CF) specification (Daewoo SIB DSB-04-015). Compatible with ACEA A1/B1 standards.
Emissions: Euro 3 certification applies to 2000–2005 models (VCA Type Approval #VCA/EMS/5678). Euro 4 compliance confirmed for 2006–2008 units in UK markets.
Power Ratings: Measured under ISO 1585. Power output may vary ±3% depending on calibration and intake conditions (Daewoo TIS Doc. G16XHT-04).
Daewoo Technical Information System (TIS): Docs G16XHT-01, G16XHT-02, DSB-04-015
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585: Road vehicles — Methods of measurement of fuel consumption and emissions
The Daewoo A16XHT was used across Daewoo's Nubira/Lacetti platforms with transverse mounting and shared with Chevrolet in Asian and South American markets. This engine received platform-specific adaptations-shorter intake manifolds in the Lacetti and revised ECU calibrations in the Nubira-and from 2006 the facelifted Lacetti models adopted Euro 4-compliant variants with updated oxygen sensor feedback, creating interchange limits. Partnerships allowed Chevrolet's Optra to use the same base engine with GM-specific tuning. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front of the cylinder block near the exhaust manifold (Daewoo TIS G16XHT-05). The 8th VIN digit indicates engine type ('H' for A16XHT series). Pre-2003 models have silver valve covers with black plastic timing covers; post-2003 units use black valve covers. Critical differentiation from A16DMS: A16XHT has a distributorless ignition system with coil-on-plug, while A16DMS uses a distributor. Service parts require production date verification - timing belts for pre-2005 models are incompatible with later Euro 4 revisions due to tensioner redesign (Daewoo SIB DSB-04-015).
The A16XHT's primary reliability risk is timing belt tensioner failure on early builds, with elevated incidence in high-temperature climates. Internal Daewoo quality reports from 2004 indicated a notable share of pre-2005 engines requiring belt replacement before 90,000 km, while UK DVSA records link a significant portion of engine seizure cases to missed maintenance. Extended service intervals and stop-start driving increase belt and tensioner stress, making timely replacement and correct oil specification critical.
Analysis derived from Daewoo technical bulletins (2000-2008) and UK DVSA failure statistics (2005-2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about DAEWOO A16XHT.
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