Rear Axle Pinion Seal May Leak on Cadillac STS

Problem Description and Possible Solution

The rear axle pinion seal may leak causing fluid loss and possible internal rear end damage. Replacing the faulty seal will commonly correct this concern.

Problem Data
RepairPal Verified
Average mileage: 74,001 (21,000–144,000)
5 model years affected: 2005, 2006, 2007, 2008, more2009
12 people reported this problem
Viewing 1 - 2 of 2 comments
just brought car , only put @ 100 miles on it and found little drop of oil on garage floor it came from rear axle its at dealership now didnt have chance to purchase extended warranty hopiing they will fix it
Bought this car used with 18000 miles on it, and the rear pinion seal let go shortly after that. The selling dealer replaced it, and so far, at 27000 it is still OK. However, the rear end hums between 35 and 50 mph.