Today a mechanic open the gauge of my Nissan xtrail 2002. There was a pressure in there that blown up the oil. The mechanic wasn't sure whats the problem. Help from you guys would be highly appreciated

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    you need to give a bit more information about this,was the overpressure when your engine was running or was the overpressure when the engine was stopped. – trond hansen Sep 16 at 12:14
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    What « gauge » did the mechanic open? – Solar Mike Sep 16 at 12:15
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    I'm going to guess that he's talking about the rear differential. There is a vent to eliminate pressure. This vent is probably blocked. – Jupiter Sep 16 at 13:02

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