Walmart has Castrol brake fluid on walmart.com

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Castrol brake fluid has been hard to find recently, but now you can get it from Walmart at a fair price
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The 32 oz bottle is $10.32
The 12 oz bottle is $4.06

Free shipping to the store

If you want it shipped directly to you, you need to order at least $35 for free shipping, otherwise $5.99 shipping charge per order under $35
 
Exactly, that's expensive for DOT 4 too.

Thou, I run Ravenol J3A1001 DOT 5.1 in both cars now, got it from Amazon when price was low.
Will switch to Bosch ESI6-32N during next brake fluid flush.
 
Originally Posted by Lubener
What's so exciting about Castrol brake fluid??


Their formula is supposed to absorb moisture more slowly than the others
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Originally Posted by A_User55555
How much better is it than the supertech or prestone brand?


It has a lower viscosity and higher wet boiling point. Dot 4 minimum is 311. Castrol's is 329
 
Both Ravenol and Bosch I mentioned above are LV fluids with 359 deg and 365 deg wet BP respectively.
I'm not sure there is point of buying or using DOT 4 anymore, imho - either very cheap DOT 3 if it can be used in the car or DOT 5.1 for better specs.
 
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