I always do a 50/50 mix. Apparently it needs water mixed in for heat transfer, don’t seeing it doing any damage though.
Personally I would do 50/50 or close to it. 70% coolant should be fine
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2009 V70 R-Design 2.0D SE Sport
2007 XC90 D5 SE Lux
2006 XC90 V8 Executive
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