Re: Coolant additives
Leaving a block empty can actually ad more issues then when in use.
Air getting to metal and you get a fair amount of rust that then gets into the core of your new radiator..
Worst is if you used plain water before draining it...
Block lower hoses ad a rustcleaner of choice and flush well...my 2c.
A regular coolant should do the job if the engine clean...but a coolant can handle just so much rust and corrosion...can usually be seen on freezing point rising when measuring coolant.
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