Illustration for article titled Oppopinions Wanted: Tap Water vs Distilled for use with Thermocure?

My MR2 still has some rust in the coolant after last week’s flush, so I’m looking at using Thermocure for a more comprehensive flush.


Should I invest in distilled water to go with this for the cleaning process, or will tap water be okay? Engine is an iron block, so I’m looking to make sure I don’t make the rust worse using the wrong water with this setup.

Also, any recommendations on coolant once the system’s clean? 

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