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#1: oil on the cam cover, under the black plastic cover, is from an old dried up oil cap gasket. Get a new one after you figure out what is causing the lack of vacuum in the crankcase.
#2: positive pressure in the crankcase, check two items. The vacuum line from the intake manifold starting just to the left of the #1 cylinder and going under the manifold to the flametrap by the throttle, may be clogged or the elbow is cracked at the bend by #1 cyl. This is a small diameter hose and is easily clogged.
The flame trap may have a plastic screen in it. Throw it away!
The diagram you saw in Kitty's post is wrong. The lines coming out of the oil separator box should be reversed. And it is for a turbo. So the large line that goes to the throttle area is what your flame trap connects to.
#3 Check the air pipe from the air filter to the throttle body for cracks. Also loog for disconnected or cracked small vacuum lines/elbows. These items can change the vacuum pressure in the intake manifold and reduce mpg.
OIL consumption: none of the above should have any bearing on the engine drinking oil. Excess vacuum (which you do not have) would draw crankcase vents through worn valve guides and suck up oil. This still sounds like the rings are letting oil get by them and getting into the combustion chambers. A compression test will show if this is so, and the repair cost 3 times as much as the car is worth.
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My back feels better when I sit in a Volvo seat
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