The Daewoo F18S2 is a 1,796 cc, inline-four, naturally aspirated petrol engine produced between 2002 and 2008. It belongs to 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 77 kW (105 PS) and 155 Nm of torque, it delivers reliable low-end performance suitable for compact hatchbacks and sedans.
Fitted to models such as the Daewoo Kalos and Chevrolet Aveo, the F18S2 was engineered for economical city driving and dependable daily commuting. Emissions compliance was achieved through a three-way catalytic converter and closed-loop oxygen sensor control, allowing it to meet Euro 3 and later Euro 4 standards across European markets during its production run.
One documented service concern involves premature wear of the hydraulic valve lifters, which can lead to persistent tapping noise under the valve cover. This issue, referenced in Daewoo Service Information Bulletin DSB-05-018, is typically associated with extended oil change intervals or use of non-specification lubricants. In 2005, revised lifter designs were introduced in the Kalos production line to improve long-term reliability.
Daewoo
Production years 2002–2004 meet Euro 3 standards; 2005–2008 models comply with Euro 4 (VCA UK Type Approval #VCA/EMS/4567).
The Daewoo F18S2 is a 1,796 cc inline-four petrol engine engineered for compact hatchbacks and sedans (2002-2008). It combines multi-point fuel injection with a dual overhead camshaft (DOHC) valvetrain to deliver smooth and responsive performance. Designed to meet Euro 3 and later Euro 4 emissions standards, it balances fuel economy with dependable drivability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,796 cc | |
| Fuel type | Petrol (Unleaded, 95 RON) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 80.5 mm × 88.2 mm | |
| Power output | 77 kW (105 PS) @ 5,800 rpm | |
| Torque | 155 Nm @ 3,500 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | Euro 3 (2002–2004); Euro 4 (2005–2008) | |
| Compression ratio | 10.3:1 | |
| 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 | 132 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. The 10.3:1 compression ratio allows compatibility with standard unleaded fuel, though higher-octane fuel can reduce knock under sustained load. The MPFI system is robust but sensitive to clogged injectors if low-quality fuel is used regularly. Pre-2005 models should be inspected for lifter wear per Daewoo SIB DSB-05-018; post-2005 units feature upgraded components. 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-05-018). Compatible with ACEA A1/B1 standards.
Emissions: Euro 3 certification applies to 2002–2004 models (VCA Type Approval #VCA/EMS/4567). Euro 4 compliance confirmed for 2005–2008 units in UK markets.
Power Ratings: Measured under ISO 1585. Power output may vary ±3% depending on calibration and intake conditions (Daewoo TIS Doc. G18S2-04).
Daewoo Technical Information System (TIS): Docs G18S2-01, G18S2-02, DSB-05-018
VCA Type Approval Database (VCA/EMS/4567)
ISO 1585: Road vehicles — Methods of measurement of fuel consumption and emissions
The Daewoo F18S2 was used across Daewoo's Kalos platform with transverse mounting and shared with Chevrolet in Asian and South American markets. This engine received platform-specific adaptations-shorter intake manifolds in the Kalos and revised ECU calibrations in the Aveo-and from 2005 the facelifted Kalos models adopted Euro 4-compliant variants with updated oxygen sensor feedback, creating interchange limits. Partnerships allowed Chevrolet's Aveo 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 G18S2-05). The 8th VIN digit indicates engine type ('S' for F18S2 series). Pre-2005 models have silver valve covers with black plastic timing covers; post-2005 units use black valve covers. Critical differentiation from F16D4: F18S2 has a distributorless ignition system with coil-on-plug, while F16D4 uses a distributor. Service parts require production date verification - lifters for pre-2005 models are incompatible with later Euro 4 revisions due to internal redesign (Daewoo SIB DSB-05-018).
The F18S2's primary reliability risk is hydraulic lifter wear on early builds, with elevated incidence in high-mileage applications. Internal Daewoo quality reports from 2004 indicated a notable share of pre-2005 engines requiring lifter replacement before 100,000 km, while UK DVSA records link a significant portion of engine-related MOT advisories to valve train noise in city-driven vehicles. Extended service intervals and stop-start driving increase lifter and camshaft stress, making timely oil changes and correct oil specification critical.
Analysis derived from Daewoo technical bulletins (2002-2008) and UK DVSA failure statistics (2005-2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about DAEWOO F18S2.
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