Good People,

I know to prevent head corrosion we have to flush the 4 gallons of coolant
every 2 years.  I'm contemplating after my next flush putting vr-12 in my
coolant every 6 months to replenish the additives and anti corrosives and
to maintain coolant ph to avoid head corrosion, instead of having to flush
the system.  Wondering if anyone has any experience using products like
vr-12?  thanks for your time.  peace tom