Fault-tracing information

Condition 

Fig 1: View Of Rear Differential Assembly And Drive Shafts

Courtesy of VOLVO CARS OF NORTH AMERICA.

Leakage from the bleed nipple, almost only ever occurs during winter months.

Possible Source 

• Incorrect tire dimensions
• The oil froths
• Faulty seals.

Fault symptom[s] 

• Acrid odor in the passenger compartment
• Oil odor
• Oil spillage under the car.