[njsteve]

It doesn't turn to jelly if mixed. But they are not compatible. Only put in Dot 5 if it is a new fresh system that has not been filled yet with Dot 3. X2 on the frequent flushing. Dot 5 will go bad over time - when I flushed the Dot 5 in Charger a few years ago it had turned dark yellow from the original purple color. It was 5 years old at the time.

Just over the weekend I looked at the original Dot 3 fluid in our 2001 WS6 Trans Am and noticed that the fluid had turned a dark green. NASTY! I suctioned out the reservoir and refilled it with Dot 3. I will be flushing the entire system in the next week or so to get rid of the rest.

I have used Dot 5 in some of my cars - especially the Mopars since everything is body color under the hood and really hard to repaint if damaged by brake fluid. Dot 5 doesn't hurt paint.