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?

http://www.castrol.com/liveassets/bp...uid136x200.jpg

dont use synthetic fluid.

dam^&t!

why not?

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).

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.

DOT rating 4=good

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?

I always thought it was glycol based, or a derivative of.... if so, its organic matter, from plants I believe.

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