nick brearley wrote:
> Recent years I've moved away from replacing coolant on a
> two year cycle and gone over to testing for freeze
> protection <...> If anyone can see a flaw in this
> thinking I'd be grateful to hear it before the chickens
> come home to roost.
Just one flaw. Anti-freeze protection is just one function of the
coolant. It also provides lubrication for water pump seals, and
anti-corrosion protection for the metal in the engine/cooling system.
Although the anti-freeze protection doesn't wear out (it should pretty
much last forever), the rest of the stuff is used up. That's why you
need to change the coolant periodically - not because it won't stop
things from freezing.