# How tight does an oil filler cap have to be?

**URL:** <https://community.cartalk.com/t/how-tight-does-an-oil-filler-cap-have-to-be/134935>\
**Category:** Maintenance/Repairs\
**Created:** [February 18, 2019, 11:17pm UTC](https://community.cartalk.com/t/how-tight-does-an-oil-filler-cap-have-to-be/134935 "2019-02-18T23:17:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Waterbuff](https://avatars.discourse-cdn.com/v4/letter/w/f07891/32.png) [@Waterbuff](https://community.cartalk.com/u/Waterbuff)\
**Post date:** [February 18, 2019, 11:17pm UTC](https://community.cartalk.com/t/how-tight-does-an-oil-filler-cap-have-to-be/134935/1 "2019-02-18T23:17:58Z")

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Not a life or death question – more like a ‘hmmmm… is a gasket needed because could oil vapors be escaping around the cap?’ kind of question.

I have an aftermarket oil filler cap that I got many years ago (because the original one broke) which has been working fine. It did not have a gasket.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [February 18, 2019, 11:50pm UTC](https://community.cartalk.com/t/how-tight-does-an-oil-filler-cap-have-to-be/134935/2 "2019-02-18T23:50:48Z")

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It should have a gasket or an O-ring. Finger tight.