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I stand corrected on the sludge forming issue. As for the seals - good to know that DOT 3 does not (apparently) harm seals in M35 brake systems. I'll probably use it simply because it means I can keep one type of brake fluid on hand for all my vehicles.

That, I'm not sure of. I've always been extremely careful to avoid mixing the two - nearly put the wrong one in my first jeep when I rebuilt the brakes though! I'm still not sure if you need to replace all the rubber seals in your brake system or not. Hopefully DOT 3 doesn't damage DOT 5...

Because DOT 3 and DOT 5 are not the same chemical. Synthetic or not it will not change the fact that they are different chemically and will not behave well when mixed. Figure it's like oil and water... doesn't matter if you boil or filter the water, it still aint mixing with the oil.

Synthetic just tells how the chemical was made - if it was man created instead of distilled from some naturally occurring source, it is synthetic. Think of synthetic vs non synthetic as electric vs non electric musical instruments - you can have an electric or non electric guitar and you can...

X3 on that! I know that DOT 5 in a DOT 3 system will ruin all the seals because they are dissolved by oil based fluids, don't know if putting DOT 3 in a DOT 5 system will do the same thing though. Anyone know for sure?