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CORRECT BRAKE FLUID for C6 : ATE SL or ATE SL.6 ?
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citroenroen1   
Sun Nov 02 2025, 05:54pm
Joined: Apr 18 2024
Member No: #5495
Location: Los Angeles
 The C6 master cylinder reservoir has ATE on the reservoir: so I will use ATE Brake Fluid when I flush / renew the brake fluid.

Which type of ATE brake fluid is CORRECT for the C6 ?
ATE SL (Dot4) or ATE SL.6 (DOT 4) ?

The factory download says to disconnect the battery : Why would it be necessary to disconnect the battery ?
MGmike   
Sun Nov 02 2025, 11:21pm

Joined: May 21 2017
Member No: #3151
Location: South Queensferry
 ATE SL will be adequate for the operating temperatures you will be running the car in. SL.6 has a lower viscosity which will help in cold climates.

As SL.6 has a lower viscosity it is also recommended for ABS, ESP & ASR equipped vehicles like the C6 but my interpretation of the specification is that only becomes a factor at low temperature.

If you can get SL.6 at an acceptable price, go for it. If not, then SL Dot 4 will be an adequate alternative for you.
citroenroen1   
Mon Nov 03 2025, 04:24pm
Joined: Apr 18 2024
Member No: #5495
Location: Los Angeles
 Regarding CITROEN download which states " disconnect battery " :
WHY would battery need to be disconnected ?
C6Dave   
Mon Nov 03 2025, 05:48pm


Joined: Oct 01 2009
Member No: #1
Location: Northumberland
citroenroen1 wrote ...

Regarding CITROEN download which states " disconnect battery " :
WHY would battery need to be disconnected ?

For safety, but the option not to is down to you.
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