2004 Nissan Micra Sr Auto Losing Engine Oil There Build Pressure Crankcase

2004 NISSAN MICRA
52,000 MILES
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My 2004 Micra SR Auto is losing engine oil. There is a build up of pressure in the crankcase when the engine is running: when I switch off the engine and remove the dipstick there is a fairly strong release of pressure, the same with the oil filler cap. I can't locate the engine breather which (in the old days) was a simple pipe into the air filter housing. Should the crankcase be relatively pressure free?
The oil appears to be coming from the rear main oil seal that was changed some months back.
Oct 22, 2012 at 11:08 AM
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RASMATAZ
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Inspect/Test the PCV ( Positive Crankcase Ventilation ) valve -start here
Oct 22, 2012 at 11:12 AM
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