/ Wrong brake fluid advice please

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The Potato 10 Aug 2019

cleaned and bled my 2nd bikes brakes as I reaslied one piston in each had seized, not a problem ive done this before, calipers off, pistons out and cleaned. All working again nicely and new pads in, lovely.

Then I realise I put mineral oil in what had previously had dot 4......
I know that using dot 4 in mineral oil brakes (shimano) will kill the seals and stop the brakes from working, but what about the other way around, have I made a big boob or will it be ok with mineral oil?
If so is it just the piston seals or are there others?

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richlan 10 Aug 2019
In reply to The Potato:

I suspect mixing DOT and mineral is not good, I would drain, flush and use what the brake manufacturer has specified.

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