The filler cap and manual both specify DOT 3--"Delco Supreme 11" or equivalent.
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Lets look at what the DOT ratings mean. The table below shows the MINIMUM wet and dry boiling points for DOT 2, 3, 4, and 5 brake fluid in degrees fahrenheit.
DOT 2 DOT 3 DOT 4 DOT 5
Dry Boiling point 374 401 446 500
Wet boiling point 284 311 356
The DOT 2 spec is for drum brakes and is obsolete. If you have any DOT 2 in your garage, throw it away!
DOT 5 is for silicone brake fluid. Silicone brake fluid (DOT 5) should be avoided because it is not compatible with regular brake fluid, it is hard to pour without introducing bubbles and thus results in soft pedal feel, and moisture still gets into your system and will pool in low areas like your calipers and encourage rapid corrosion. STAY AWAY!
That leaves DOT 3 and DOT 4 fluids. These fluids are compatible with each other and may be interchanged or mixed with no ill effects.
I haven't had any problems at that time adding Prestone DOT 4 to the original GM fluid.
Changing BRAKE FLUID is a MUST. Most dealers recomend at 60K scheduled maintenance service.
The industry standard is every 3 to 4 years for DOT 3 and every 2 years for DOT 4 under normal driving conditions.
Should be dot 4. On top of the cap it should say. Look at the top of your brake resevoir cap and see if it doesn't say Dot4.
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