# Using DOT 4 instead of DOT 3

**URL:** <https://community.cartalk.com/t/using-dot-4-instead-of-dot-3/15062>\
**Category:** Maintenance/Repairs\
**Created:** [June 9, 2008, 1:47pm UTC](https://community.cartalk.com/t/using-dot-4-instead-of-dot-3/15062 "2008-06-09T13:47:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![JorgeT](https://avatars.discourse-cdn.com/v4/letter/j/d6d6ee/32.png) [@JorgeT](https://community.cartalk.com/u/JorgeT)\
**Post date:** [June 9, 2008, 1:47pm UTC](https://community.cartalk.com/t/using-dot-4-instead-of-dot-3/15062/1 "2008-06-09T13:47:22Z")

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Can i drain all my DOT3 Fluid from the brake system and replaced it with DOT4 to add a littble bit more of resistance to Boiling Point is it safe? my car is designed for DOT3 by the way

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**Author:** ![jayhawkroy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/jayhawkroy/32/33_2.png) [@jayhawkroy](https://community.cartalk.com/u/jayhawkroy)\
**Post date:** [June 9, 2008, 1:56pm UTC](https://community.cartalk.com/t/using-dot-4-instead-of-dot-3/15062/2 "2008-06-09T13:56:05Z")

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DOT3 and DOT 4 fluids are mutually compatible, so no issue using DOT 4 where DOT 3 is specified.

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**Author:** ![Craig58](https://avatars.discourse-cdn.com/v4/letter/c/3da27b/32.png) [@Craig58](https://community.cartalk.com/u/Craig58)\
**Post date:** [June 9, 2008, 2:08pm UTC](https://community.cartalk.com/t/using-dot-4-instead-of-dot-3/15062/3 "2008-06-09T14:08:04Z")

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Yes, if you read the label on DOT4 fluid it should say that it can be used for DOT3 applications. Do not use DOT5 fluid in your car.