Audi A4 / A6 2.5 TDI engines from 2003 onwards, which are part of Audi’s V6 TDI diesel engine family — a longitudinally mounted 2.5L V6 widely used in Audi models from the late ’90s through the mid-2000s.
🔧 Audi 2.5 TDI V6 Overview (2003+)
| Spec | Detail |
|---|---|
| Engine Size | 2.5 litres (2496cc) |
| Configuration | V6, 90° |
| Valvetrain | DOHC 24-valve (4 valves per cylinder) |
| Fuel Injection | Direct Injection (Bosch VP44 rotary pump OR common-rail in late models) |
| Aspiration | Turbocharged with intercooler |
| Turbo Type | VNT (variable geometry turbo) |
| Emission Standard | Euro 3 → early Euro 4 |
| Drivetrain | FWD or quattro |
| Gearbox | 5/6-speed manual or 5-speed Tiptronic automatic |
| Timing | Belt-driven cams, but also gear-to-gear between cams |
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