Replacing fluids

Had my ZR for 4 days now, all fluids checked daily and nothing amiss. I would like to buy some spares, though, but I'm just wondering, not knowing what has previously been used, whether a K is sensitive to mixing different coolant brands? I understand it is OAT coolant I need? And oil will be 10w40? Service history suggests last oil change was done at 70684, dated 12-4-2013. The car is now on around 77500. Filter was included in this service.



Any advice is welcome. I thought about replacing the coolant, but really it seems unnecessary, and I don't want to upset anything as it runs sweet currently.

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