Subaru Outback owners have reported 2 problems related to axle shaft seal (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Subaru Outback based on all problems reported for the Outback.
Transmission failure due to seal leaking fluid to front differential. Requires new transmission.
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Wheel bearing was leaking grease when it was lubricated which caused an unusual noise. Dealer replaced the seal for the wheel bearings.