Engines are classified with reference to 5 build-specific features, two examples of which are included below.
| Petrol engine (example) | Diesel engine (example) | ||
|---|---|---|---|
| Z | Exhaust standard | Y | Exhaust standard |
| 16 | Engine size | 20 | Engine size |
| X | Compression ratio | D | Mix system |
| E | Mix system | T | Specific version |
| H | Specific version | ||
Notes:
| Exhaust standard | Y | 68/69/EG, Euro 3 / D3 or Euro 3 / D4 | ||
|---|---|---|---|---|
| Z | 68/69/EG, Euro 3 / D4 or Euro 4 | |||
| Engine size | x 0.1 = piston displacement in litres | |||
| Compression ratio | L | > 8.5 - 9.0 : 1 | X | > 10.0 - 11.5 : 1 |
| N | > 9.0 - 9.5 : 1 | Y | > 11.5 : 1 | |
| S | > 9.5 - 10.0 : 1 | |||
| Mix system | D | Diesel | NG | Natural gas |
| E | Injection | |||
| Special version (upon request) | H | High performance | T | Turbocharging |
| L | Low performance/charging | P | Closed channel | |
| R | Enhanced performance | |||
Diagram L0008519 shows an example of possible locations engine classification