Coolant/water pump

[JimX]

I am just wondering what are the consequences of not changing the coolant other than not being good for the water pump? I've heard one tale that old coolant is actually BETTER for your engine than new coolant, because it's already saturated with oxidised metal particles from the water galleries, which makes it harder to have further effect on the internals.

The reason I ask is the car's coming up to its 100k km service. The timing belt has already been replaced but the coolant is getting a bit old, so I was thinking of just letting it stay that way until the water pump dies, and then put some good stuff in with the new pump.

[nismoman18]

old coolant is not good for the hoses, u should have ur radiator flushed every 50k i think cos it gets corrosive and dirty. i dont think its better if its old man