Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
11 00 Engine, General Information
N55 ENGINE (UP TO MODEL YEAR 2018):
| Cylinder | 6 | |
| Bore hole | mm | 84 |
| Stroke | mm | 89.6 |
| Effective displacement | cm3 | 2979 |
| Compression ratio | :1 | 10.2 |
| Max. permissible engine speed | 1/min | 7000 |
| Permissible constant speed | 1/min | 6500 |
| Compression pressure: Minimum and maximum values, Valvetronic at full load. |
10...16 | |
| Compression pressure: Maximum deviation of all cylinders to each other. |
bar | 2 |
S55 ENGINE (AS OF MODEL YEAR 2019):
| Cylinder | 6 | |
| Bore hole | mm | 84 |
| Stroke | mm | 89.6 |
| Effective displacement | cm3 | 2979 |
| Compression ratio: | 1 | 10.2 |
| Max. permissible engine speed | 1/min | 7500 |
| Permissible constant speed | 1/min | 6500 |
| Compression pressure: Minimum and maximum values, Valvetronic at full load. |
10...16 | |
| Compression pressure: Maximum deviation of all cylinders to each other. |
bar | 2 |
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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