Rear Axle Pinion Seal May Leak on Cadillac STS

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.

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Average mileage: 74,001 (21,000–144,000)
5 model years affected: 2005, 2006, 2007, 2008, more2009
12 people reported this problem
2 people shared problem details
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
2005 Cadillac STS21,000
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.
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