Case Study Oil Leak on BMW 116i F20

Customer Complaint:
The customer reported an oil leak near the turbocharger area.

Vehicle Details:

• Make: BMW
• Model: 116i F20
• Year: 2014
• Engine: N13

Diagnostic Process:

1. Initial Inspection:

   • Confirmed the oil leak was originating from the turbocharger area.
   • Found oil dripping near the turbo drain pipe and pooling beneath the turbo assembly.

2. Detailed Component Inspection:

   • Turbo Drain Pipe O-Ring:
     • Observed the O-ring on the turbo drain pipe was worn and leaking oil.
   • Coolant Breather Line:
     • Detected oil contamination on the coolant breather line situated under the turbo, causing the line to degrade.
   • Rocker Cover Gasket:
     • Identified an additional oil leak from the rocker cover gasket.

3. Leak Analysis:

   • The oil leak from the turbo drain pipe O-ring was flowing down and damaging the coolant breather line.
   • The rocker cover gasket leak was contributing to oil seepage around the engine.

Repair Process:

1. Turbo Drain Pipe O-Ring Replacement:

   • Removed the turbo drain pipe.
   • Replaced the damaged O-ring with a new one to eliminate the leak at the drain point.

2. Coolant Breather Line Replacement:

   • Replaced the damaged coolant breather line to prevent future issues and ensure proper coolant system functionality.

3. Rocker Cover Gasket Replacement:

   • Removed the rocker cover.
   • Installed a new gasket to resolve the oil leak from the top of the engine.

4. Post-Repair Clean-Up and Testing:

   • Cleaned the engine bay to remove residual oil.
   • Conducted a pressure test on the coolant system to ensure the new breather line was functioning correctly.
   • Performed a road test to confirm there were no further oil leaks.

Outcome:
The repairs successfully resolved all oil leaks. The turbo drain pipe O-ring, coolant breather line, and rocker cover gasket were replaced, restoring the engine’s integrity and performance.

Key Takeaways:

• Oil leaks can have cascading effects, damaging other components such as coolant lines.
• Timely inspection and replacement of critical gaskets and seals prevent further engine damage.
• Comprehensive post-repair testing ensures reliability and customer satisfaction.

Service Provided By:
Giz Tech Automotive
Reliable automotive repair services in Manukau.