Dot 5.1 brake fluid

[Dom]

Got a litre of this in the garage that I didn't use in one of my old cars. Beemer is going in for oil service and brake fluid change tomorrow, can I give them this to use?

[iKst]

If its properly stored then yes. If its was open for too long then its probably not a good idea.

[Dom]

it's still in the bottle... I'll take it with me and see what they say as the beemer is dot 3 standard I think?

[iKst]

Its DOT 3 because there were no DOT 4 and DOT 5.1 in those days

DOT 5.1 is 100% "compatible" with DOT 3 and 4...just better. Higher boiling point, more resistant to water etc. If its in original bottle and is not open than it will be ok.