So I was checking my R51s coolant level.
it was full
but when taking off the cap a little spilled from under the cap
So I decided to top of the little space with maybe 4-5 table spoonfuls of distilled water.
To my horror next day I found out it was the wrong bottle i had grabbed..
It was "drinking water" from "fluroidated carbon filtered municipal water soruce" with all the minerals .
I take great care with my coolant.
My radiator is 3 months young and so was the coolant fill.
Now its been contaminated.
yes its tiny but it still bugs me.