Coolant change -do you?

[viper blue]

My Seven has organic (OAT) coolant; question do you drain the system and replace, if so at what frequency ( miles or period)?

Some say 5 years my tin top says 10 years.

Thanks

[HustleRussell]

In the absence of more informed posts, I'll have a go...
Mine gets replaced all the time, mostly due to engine/radiator/coolant pipe changes! However if it were a road car my view would be that coolant, like engine oil, protects and preserves the longevity of your engine. Changing it isn't too tough or expensive either. Therefore, I'd change if in any doubt about it's quality or concentration, if it looks dirty, and failing all that, at a sensible interval. 5 years does sound sensible.