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Discussion in '365 GT4 2+2/400/412' started by CARUSO, Feb 12, 2018.
For 400I Auto year 1984 DOT3 or DOT4 ?
IDK, but it'll be in the manual
DOT 3 is original fluid, don't mix brake fluids, you could use DOT 4 if you are completely cleaning/flushing the entire brake system, 4 has a higher boiling point.
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No problem mixing DOT 3 & 4 as they are both glycol based. Boiling point of a mixture would be tough to calculate but would ostensibly be an improvement over 100% DOT3.
It's DOT 5 silicone fluid that shouldn't be mixed with others. If going to DOT 5 which is not hygroscopic thoroughly flush all the old fluids first. Dot 5 should only go into a dry system which is going to require some dismantling.
You can use DOT5.1 which is also a glycol based fluid with higher boiling point than DOT3 and DOT4.
I would never use DOT 5 in a glycol fluid based brake system because there i s danger of destroying the rubber parts. Results are clear if this happens.