# Why’d my oil cap blow off my 2005 Nissan Altima?

**URL:** <https://community.cartalk.com/t/why-d-my-oil-cap-blow-off-my-2005-nissan-altima/122311>\
**Category:** Maintenance/Repairs\
**Tags:** nissan, altima\
**Created:** [August 5, 2018, 3:21am UTC](https://community.cartalk.com/t/why-d-my-oil-cap-blow-off-my-2005-nissan-altima/122311 "2018-08-05T03:21:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ronnie01](https://avatars.discourse-cdn.com/v4/letter/r/7ea924/32.png) [@Ronnie01](https://community.cartalk.com/u/Ronnie01)\
**Post date:** [August 5, 2018, 3:21am UTC](https://community.cartalk.com/t/why-d-my-oil-cap-blow-off-my-2005-nissan-altima/122311/1 "2018-08-05T03:21:03Z")

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What cause the oil cap to blow off I put it back drove less two miles and it came oil again

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**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\
**Post date:** [August 5, 2018, 12:45pm UTC](https://community.cartalk.com/t/why-d-my-oil-cap-blow-off-my-2005-nissan-altima/122311/2 "2018-08-05T12:45:52Z")

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That would seem to indicate an abnormally high level of pressure in the crankcase, and that is not a good thing.  
First, check the PCV valve and replace it if it you can’t hear it rattle when you shake it. If that doesn’t remedy the situation, then I would speculate that you have a breached head gasket.

Have you checked the coolant for evidence of oil contamination?  
Have you checked the oil for evidence of coolant contamination?