One problem related to blown head gasket has been reported for the 2001 Subaru Outback. The most recently reported issues are listed below.
In 2003 at 74,000 miles the left gasket was replaced on 2001, Subaru Outback ltd. Wagon. In 2003 at 94,000 miles right gasket was replaced. 20 months later left gasket was blown out again. Two independent mechanics told consumer that right gasket was defective as well although the dealership told consumer no. Subaru of America paid for the repairs of both of the initial gasket replacements, but due to the mileage on the car they refused to cover this defective part. In 2004 car was recalled to receive a sealant additive to address the gasket problem. Clearly it didn't work. Many of consumer friends and neighbors are Subaru Outback owners, and 2 others I have spoken with have had blown gaskets on fairly new vehicles.