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I have a 258 I6 and it has 2 pcv valves and a breather @oil cap hole with a hose to the air cleaner. Question is, is all this nessasary? Could it cause problems?
 

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That's strange, I'm not sure what you mean by the breather at the oil cap hole. So you don't have an oil cap? A few pictures would be nice but 1 hole should be your oil cap 1 hole should have a PCV and the other should be a crankcase breather, which should be hooked to your air cleaner or a breather filter of some sort.
 
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