1. watch out for driver's side HG coolant/oil seepage and passenger's
side oil seepage; as a rule oil seeps  in a summer, and coolant  during
winter months; just watch the levels of both fluids and replenish if
necessary;  also - in order to avoid catastrophic damage to your head
gaskets, take it easy with accelerator pedal ( no green light
racing...), and make sure special sealant was added to antifreeze by a
dealer - pursuant to one of Subaru recalls

2. service your transmission, FRONT  and REAR   differentials on
regular basis

3. in a case of flat tire, never drive  on  "mini spare" or - as some
call it "donut" tire - either have your car towed (flatbed!) to  tire
shop or just have someone  bring you extra tire w/rim; make sure tires
are  exactly same size -  as a regular maintenance procedure, rotate
front- to- rear - every 6K miles ( 10K kilometers, if you live in
Canada), and if you  buy new tires, put on all four

4. replace pcv valve every  2 years ( 2.5  subie 4's are  real
sensitive  to  pressure buildup in crankcase, and if pcv valve is
clogged  they easily blow front crank seal)

you are buying a great automobile, good luck !