Engine Oil Leakage

Engine oil leaks can arise from a variety of causes. Below are the most prevalent reasons, listed in order of frequency:

Most Common Causes:

1. Pinched or Blocked Crankcase Vent Tube
   Open the oil filler cap or dipstick and attempt to blow air through the crankcase vent to the oil filler.

2. Contaminants in the Seal
   Dirt or debris may have infiltrated the seal.

3. Worn or Improperly Installed Seal
   The seal may be worn out or was not installed correctly.

Least Common Causes:

• Burr or Rough Spot on Sealing Surface
  The sealing surface may have imperfections such as burrs or rough spots.

• Worn Bearing Supporting the Seal Surface
  The bearing that supports the seal surface may be worn.