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Question for changing clutch fluid using Ranger Method

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Old Jun 6, 2018 | 03:58 PM
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Default Question for changing clutch fluid using Ranger Method

Does it matter what type/brand of Dot 4 brake fluid is best to use when performing the Ranger Method to replace clutch fluid?

Thanks
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Old Jun 6, 2018 | 07:50 PM
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I always use the GM brake fluid. It costs a little more but I have never had a problem.Part number 10-4086 / 19299570.
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Old Jun 6, 2018 | 09:19 PM
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Per the manual:

Hydraulic Clutch Fluid. Use only GM Part No. 19299570, in
Canada 19299571, Super DOT 4 brake fluid.

Pentosin makes a Super DOT 4 brake fluid.
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Old Jun 6, 2018 | 10:49 PM
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Thanks. I ended up getting this:

Amazon Amazon
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Old Jun 7, 2018 | 12:22 PM
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I'm in trouble again.. Just used Prestone Dot 4...
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Old Jun 7, 2018 | 02:41 PM
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Valvoline dot4 synthetic is what I have used for years without issue.
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Old Jun 7, 2018 | 07:29 PM
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The GM clutch fluid used to have some additional friction modifiers that were not in regular brake fluid, so I have always just used the GM fluid. I just buy Prestone brake fluid for the brake reservoir.

The clutch reservoir only takes about 2 ounces, so you can get multiple changes from the GM bottle.. I usually just draw the fluid out of the reservoir, and put in new fluid every few months, and drive it... I have never had to go through pumping and multiple changes and the fluid has always stayed clean..

Last edited by TEXHAWK0; Jun 7, 2018 at 07:32 PM.
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Old Jun 7, 2018 | 07:32 PM
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GM makes a mediocre brake fluid at a premium price. I use Valvoline DOT 4.
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Old Jun 8, 2018 | 04:14 PM
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Originally Posted by TEXHAWK0
The GM clutch fluid used to have some additional friction modifiers that were not in regular brake fluid, so I have always just used the GM fluid. I just buy Prestone brake fluid for the brake reservoir.

The clutch reservoir only takes about 2 ounces, so you can get multiple changes from the GM bottle.. I usually just draw the fluid out of the reservoir, and put in new fluid every few months, and drive it... I have never had to go through pumping and multiple changes and the fluid has always stayed clean..


When I had a clutch issue in my C5 and did the ranger method, was admonished by a trusted member of the dealers service department for using non-gm fluid. (Emphasis on trusted, not dealer.)

Apparently, GM fluid has, amongst other additives, graphite, which will darken the fluid over time. Using non-gm fluid or fluid w/o graphite may make the clutch worse, not better.
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Old Jun 8, 2018 | 04:48 PM
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Originally Posted by aj98


When I had a clutch issue in my C5 and did the ranger method, was admonished by a trusted member of the dealers service department for using non-gm fluid. (Emphasis on trusted, not dealer.)

Apparently, GM fluid has, amongst other additives, graphite, which will darken the fluid over time. Using non-gm fluid or fluid w/o graphite may make the clutch worse, not better.
What a load of crap!
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Old Jun 8, 2018 | 09:07 PM
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Originally Posted by John Micheal Henry
I'm in trouble again.. Just used Prestone Dot 4...
Me, too. I've used it as clutch fluid in a number of cars, logging >100k in some, without issues--including my C6 and current C7.
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Old Jun 9, 2018 | 09:55 AM
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Originally Posted by juanvaldez
What a load of crap!
So are you telling me I should not trust my own parent?

Who has worked in the service department of the same Chevy dealership for almost 40 years, and has more SAE certifications than all the mechanics there combined, including multiple certs on ‘vettes?

Last edited by aj98; Jun 9, 2018 at 09:56 AM.
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Old Jun 9, 2018 | 12:46 PM
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I use Motul DOT 5.1 (not DOT 5) for my brake and clutch systems. Works great, and has a high enough boiling point for me. Its glycol based and is fully compatible with all DOT3 and DOT4 fluids also.
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Old Jun 12, 2018 | 08:03 PM
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Originally Posted by TEXHAWK0
The GM clutch fluid used to have some additional friction modifiers that were not in regular brake fluid, so I have always just used the GM fluid. I just buy Prestone brake fluid for the brake reservoir.

The clutch reservoir only takes about 2 ounces, so you can get multiple changes from the GM bottle.. I usually just draw the fluid out of the reservoir, and put in new fluid every few months, and drive it... I have never had to go through pumping and multiple changes and the fluid has always stayed clean..
Why why would clutch fluid have a friction modifier? This isn't a wet clutch like that on motorcycles. The fluid never even comes into contact with the disc/PP. It's only job is to act via a clutch master cylinder to apply pressure to PP and disengaged the disc.
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Old May 13, 2020 | 08:31 PM
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Originally Posted by itch808
Why why would clutch fluid have a friction modifier? This isn't a wet clutch like that on motorcycles. The fluid never even comes into contact with the disc/PP. It's only job is to act via a clutch master cylinder to apply pressure to PP and disengaged the disc.
Been almost 2 years and he never got back--wtf?
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