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A clogged PCV system is not dangerous (i.e., life-threatening), but it could blow out your engine's seals and cause it to dump it's oil. Depending on which seal blows out, it can be quite disastrous to your engine:
the front seals (crankshaft's, intermediate or camshaft's) will lose oil slowly;
the big "half-moon" seal at the back of your valve cover can blow and dump all your oil in a few minutes.
Fixing the blocked PCV system can be anything from easy to a really messy job, depending on what's blocked: if it's just the flame trap (and your model year happily has it up high and within reach), it may take just a few minutes; or if it's the oil trap (a box on the driver's side of the crankcase/block, it's rather upleasant and arduous to reach.
In any case, it should be checked to see if there is any blockage! Here's a simple way:
Get a small sheet of saran or other plastic food wrap (the thinner the better). With the engine running, take off the oil fill cap and lay the plastic over the opening. If it bows inward (like it's being sucked in by a mild vacuum, that's good -- you don't have a problem yet. But if it bulges outward, like its being pushed by some pressure outward, you've got a clogged system.
BTW, don't let the plastic get sucked into the engine :-).
[this test is a variation of the oil fill cap "jiggle" test, because the traditional jiggle test doesn't work on B230 engines because the cap is lightweight plastic instead of the older metal cap. But it's the same principle.]
Good luck.
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