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  #1  
Old 01-27-2009, 07:16 PM
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Castrol GTLMA Dot 3/4 (synthetic) compatibility

Recently put on new calipers in the front. When bleeding, only the rear chamber of the brake fluid reservoir diminished. I filled with this Castrol Product in the rear chamber only and did NOT flush the rear brakes.

Are there any compatibility issues with regular DOT4?



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Last edited by jt20; 01-27-2009 at 07:22 PM.
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Old 01-27-2009, 07:34 PM
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dont use synthetic fluid.
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  #3  
Old 01-27-2009, 07:37 PM
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dam^&t!

why not?
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Old 01-27-2009, 07:37 PM
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I have used Valvoline synthetic without any problems. Not that i boil my brake fluid but it has a higher boiling point than Dot 4. It is not to be confused with Dot5 fluid though (silicone).
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  #5  
Old 01-27-2009, 07:43 PM
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Castrol LMA Specifications:
DOT Rating - 4
Dry Boiling Point - 446°F
Wet Boiling Point - 329°F
Compatible with other fluids - Yes

Found it. From some racing supply sales website.
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Old 01-27-2009, 07:45 PM
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DOT rating 4=good
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  #7  
Old 01-27-2009, 07:54 PM
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Silicone fluid (DOT 5) is synthetic, but that does not mean that all synthetics are silicone. Never use DOT 5 in any DOT 3/4 application. I've seen motorcycle brakes that call for DOT 5, but never on a car.

GT-LMA has been on the market for decades (and I've used it in many cars), but I do not recall seeing "synthetic" on the label. What's "natural" about DOT 3/4 anyway?
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Old 01-27-2009, 07:58 PM
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I always thought it was glycol based, or a derivative of.... if so, its organic matter, from plants I believe.
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Old 01-27-2009, 08:08 PM
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well.. it has glycol in the name.. but certainly not natural sounding.

from Trickapedia:
Mineral-based

* Alkyl ester
* Aliphatic amine
* Diethylene glycol
* Diethylene glycol monoethyl ether
* Diethylene glycol monomethyl ether
* Dimethyl dipropylene glycol
* Polyethylene glycol monobutyl ether
* Polyethylene glycol monomethyl ether
* Polyethylene oxide
* Triethylene glycol monobutyl ether
* Triethylene glycol monoethyl ether
* Triethylene glycol monomethyl ether

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