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Crankcase ventilation.

A PCV is always a good thing to have,will it fix your problem? Prob.not. I would try and fix this issue before I spent the $$$ on a synthetic oil.Its not going to solve any problems by making the switch.

Do you actually drive the car? You need to start it up and run it around(at least 5 miles) to burn out all of the moisture that builds up in the engine.

No.

10W30 in the winter and 15-40 in the summer.

Usually after about 500 miles but since its been 4 months I would change. No special oil needed, I like Delo 400 or Rotella myself,and a good quality filter (like wix) and you need to drive that thing!