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Maintenance is higher due to parts. You need to find a qualified mechanic to work on the car.
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A 911 is wonderful in the snow with a set of quality winter tires. Use tirerack.com to and buy wheels/tires mounted. The only issue is clearance but it is not prudent really to be on roads with 5"+ deep snow.
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A general mechanic can check most things. However EVERY car has known issues. Majority of general mechanics have never touched a 911 due to low sales #'s. So they don’t know the common problems and how to identify. Even if you use a general mechanic for repairs/maintenance after it is still very prudent to have a knowledgable Porsche mechanic for checkover.