what should I do if my BMW 3 Series E90/E91 (2005-2012) smells like burning oil

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Safety warning: Disconnect the battery before working on electrical components.

2. Locate and Repair Leaks

• Tools Required: Socket set, torque wrench, oil catch pan, rags
• Remove any engine covers if necessary to access the leaking components.
• Inspect the valve cover gasket:
  • If leaking, remove the valve cover by unfastening the bolts (torque specs: 8-10 Nm).
  • Clean the mating surfaces and replace the old gasket with a new one.
  • Reinstall the valve cover and torque bolts to specifications.
• Check the oil filter:
  • Tighten if loose or replace with a new filter if damaged.
• Inspect the oil pan and gasket, and replace if leaking.

3. Address Overheating Issues

• Check the coolant level and top up if necessary.
• Inspect the radiator and hoses for blockages or leaks.
• If the engine is overheating, consider flushing the cooling system and replacing the thermostat if faulty.

4. Clean Up Residual Oil

• After repairs, clean any residual oil from the engine components and surrounding areas using degreaser.
• Check for any remaining leaks and resolve them before finishing.