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I've never had my coolant analyzed...
Using Tom's schedule (which I have used in many cars, again with no ill effect ), on the second year the mix tends to discolor. Does this mean something is awry, probably not.
My M3 has a cast iron block and the coolant looks cloudy and brown after a few months.The boxster stays clean with a red/pink hue on the yearly scheme and my interval is mostly based on taking something apart that needs the coolant drained.
For track cars, run water and a supplement of whatever brand you find handy. Straight H20 works too.
Having the system dry is fine but don't start the car! It's all too easy to do on extended projects ( I put warning post-its everywhere now)
Please, no glycol on the tarmac.
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