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I used Prestone long life (orange colour) dex-cool. Check Volvsopeed Bay13 for info on thermostat replacement and it shows how to drain the coolant. After draining, refilled the system with DI water run the engine (don't forget to turn on your heater to circulate coolant / water) until warmed up, drained and refilled couple more times until all I got was clear water with no coolant traces (you can tell by its colour). Finally refilled with pure, not mixed, coolant and topped it up with DI water. Got almost perfect 50 /50 mix.
Good luck.
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