# Oil Catch Can Benefits Debated - Why?

**URL:** <https://community.cartalk.com/t/oil-catch-can-benefits-debated-why/160533>\
**Category:** General Discussion\
**Created:** [March 8, 2020, 12:55am UTC](https://community.cartalk.com/t/oil-catch-can-benefits-debated-why/160533 "2020-03-08T00:55:23Z")\
**Posts on this page:** 1\
**Showing post:** 17

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**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [March 10, 2020, 1:15pm UTC](https://community.cartalk.com/t/oil-catch-can-benefits-debated-why/160533/17 "2020-03-10T13:15:07Z")

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> [@George\_San\_Jose1](#):
>
> before PCV systems became commonplace car engines still needed the crankcase gasses removed. That was done with a downward oriented tube from the engine that was open at the other end.

That was called a “road draft tube”.  
They would leave an oily stain down the middle of road lanes.

![](https://global.discourse-cdn.com/cartalk/original/3X/0/f/0f877c39171f6492b3993b37c5b976c2408fd405.jpeg)

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