Don't quote me on this but I'm pretty sure when the oil starts feeding back into the system that your vacuum pump is nearly failed (when it does completely it could possibly take the motor with it!). One popular upgrade is sticking an inline fuel filter in the vacuum line before the vacuum system going into the passenger compartment because it can get nasty if to much oil gets in there, also it lets you know if the oil is trying to get in so you know that you need to get working on the vacuum pump ASAP. Yes that metal line is the vacuum line, it goes to the commonly brittle plastic hose that the lines feed off of as well as the brake booster. Have you checked how much vacuum it is pulling? I believe it should be in the vicinity of 17-22"hg.
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