I heard that one way to check the PCV is to warm the engine up to operating temperature and remove the oil dipstick. If you see smoke then it needs to be replaced. Quite a bit of parts need to be removed to access the PCV housing.

Thank you for your reply MadeInJapan.

Hello everyone,
I am about to purchase a 2008 C70 and would appreciate any input on what to look for. My biggest concern is the mileage at 129,000.
It looks well maintained, no oil leaks, smooth transmission. Nice looking car. I do believe that the camshaft belt was changed some time ago. And hope ...