Turbocharger Seals Are Unlike General Oil Seals, They Are Similar To Piston Rings. They Require Positive Air Pressure Inside The Compressor Housing And Turbine Housing To Keep Oil From Pushing Past Them, Essentially Like A Balance Of Both. A Restriction In The Intake Side Will Create a Vacuum Effect That Will To Pull Oil Past The Seals At The Compressor End Housing. Extended Periods Of Engine Idle Work Will Present Similar Issues, The Turbo Will Rotate At Very Low Speed With Low Air Pressure. The Resulting Vacuum Will Cause Oil To Seep Into The Turbine Housing.
What Can Cause Oil Leaks On Your Turbocharger?
- RestrictionsIn The Oil Drain Pipe.
- Exesive Oil Pressure (Yes You Can Have To Much)
- FaultyEngine Breather / PCV System.
- Oil Drain Gasket Fitted Incorectly Or Has Exesive Sealant.
- Blocked Ait Fliter.
- Extreme Amount Of Engine Blow By.