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DOT3 or DOT4

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Old Jul 24, 2009 | 02:03 PM
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Default DOT3 or DOT4

I was going to change the fluid in my clutch and I went and bought some DOT4 fluid as it has a higher temp. The clerk at the parts store told me to ensure that I drain all the DOT3 fluid out as the DOT4 is not compatible with it, it will gel up. Has anyone heard of this or can shed some light on the compatabilty of the two.
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Old Jul 24, 2009 | 02:09 PM
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All the ones I have seen are 100% compatable. It will usually say on the bottle as well.
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Old Jul 24, 2009 | 02:20 PM
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Suggest you read the label on the can. It should state what it's compatible with.

Generally store clerks are pretty clueless on such matters. Better info is from owners on the CF.

C6 owner's manuals state use DOT4 brake fluid in the clutch. So unless you've gone to something else, you've got GM-brand Super DOT4 in the hydraulics from the factory.

Ranger
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Old Jul 24, 2009 | 03:05 PM
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Every DOT 4 I have seen is compatible with DOT 3
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Old Jul 24, 2009 | 04:18 PM
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Originally Posted by rws.1
Every DOT 4 I have seen is compatible with DOT 3
My 08 came with DOT4 clutch fluid, your car also should already have DOT4 from the factory unless someone F'd-up during the cars life.
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Old Jul 24, 2009 | 04:51 PM
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You can use DOT 3, 4 or 5.1 You cannot use DOT 5 (Silicone based).
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Old Jul 24, 2009 | 05:04 PM
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I used Prestone DOT 4
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Old Jul 24, 2009 | 05:56 PM
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just got a can of GM super dot4 for 7 bucks at the dealer gonna use the ranger method to clean it up
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