306 coolant

I have a year 2000 306 Meridian 1.6 petrol. Can anybody confirm when the
coolant should be changed? Peugeot say it never needs to be changed, just
topped up. One dealer said it should be changed every 2 years. Another
dealer said it should be changed every 80k miles. The manual mentions Procor
TM108 antifreeze - is this essential, or is it ok to top it up with any
standard antifreeze?

Thanks

 

will be stated in your car handbook but i personally change my a/f every 2
years because it goes acidic with time

 

You never mix different types of coolent, not even the same type with
different ages...

 

The car handbook of my 306, says every 2 years or 80.000 km.
Why not mix different types of coolent, or the same type with
different ages? I used to this always in my previous cars, a 309,
Suzuki Swift, VW-Golf, Xsara, Saxo. They all seems to be filled
up after some time. The 306 I now have (build 2001), has always
enough coolant. I never see the level of the coolant under the min.