The Vauxhall C20LET OPC is a 1,998 cc, inline‑four turbocharged petrol engine produced between 1997 and 2002. It features a double overhead camshaft (DOHC), 16‑valve layout with sequential multi‑point fuel injection and a cast‑iron block with aluminium cylinder head. In standard OPC form it delivered 147 kW (200 PS) and 250 Nm of torque, providing aggressive performance with strong mid‑range response ideal for hot hatch applications.
Fitted exclusively to the Astra G…
All production years (1997–2002) meet Euro 2 standards .
The Vauxhall C20LET OPC is a 1,998 cc inline‑four turbocharged petrol engine engineered for high-performance hatchbacks (1997–2002). It combines sequential multi‑point fuel injection with a Garrett T25 turbocharger to deliver responsive power delivery and track-capable acceleration. Designed to meet Euro 2 emissions standards, it prioritizes performance within regulatory limits of its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 86.0 mm | |
Power output | 147 kW (200 PS) | |
Torque | 250 Nm @ 2,400 rpm | |
Fuel system | Bosch Motronic MPFI (sequential) | |
Emissions standard | Euro 2 | |
Compression ratio | 8.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Garrett T25 (fixed geometry) | |
Timing system | Belt‑driven camshafts | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 132 kg |
The Vauxhall C20LET OPC was used exclusively in Vauxhall's Astra G performance variants with transverse mounting and no external licensing. This engine received platform-specific adaptations—upgraded engine mounts, reinforced subframe, and oil cooler in the Astra G Coupe OPC—and minor ECU calibration updates in 1999 improved boost control response, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The C20LET OPC offers exhilarating performance but requires disciplined maintenance. Exhaust manifold cracking and turbo seal wear are common under hard use. With premium fuel, correct oil, and adherence to service intervals, well-maintained examples can exceed 150,000 km reliably.
Top issues include exhaust manifold cracks (EB‑98‑012), turbo oil seal failure, throttle body potentiometer wear, and coolant sensor drift. These are documented in Vauxhall engineering bulletins and UK MOT data. Use of RON 98 fuel and Dexos1 oil mitigates many risks.
The C20LET OPC was used exclusively in the Astra G Coupe (1997–2002) and limited-edition Astra G Hatchback OPC (1998–2000). It was never licensed to other manufacturers and is not found in Zafira, Vectra, or commercial vans.
Aftermarket ECU tuning is common on the C20LET-OPC platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Real-world consumption is ~12.0 L/100km (city) and ~8.2 L/100km (highway), or ~27 mpg UK combined in an Astra OPC. With conservative driving, 29–32 mpg UK is achievable on mixed routes for a healthy engine.
Yes. The C20LET OPC is an interference design. If the timing belt fails, pistons will contact open valves, causing severe internal damage. This makes the 60,000 km belt replacement interval non-negotiable for engine survival.
Vauxhall specifies GM Dexos1 10W‑40 semi-synthetic oil. This ensures proper lubrication of the turbocharger bearings and DOHC valvetrain under high thermal load. Always change oil at or before 10,000 km or annually for performance applications.
Comprehensive technical documentation and regulatory references
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EUR-Lex
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)
UK type-approval authority for automotive products.
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.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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