Depends on what's in it and how old it is. 2 types OAT and NOAT. You can't mix them or you end up with a gelatinous mess and serious heating issues. If you don't know for sure, flush it several times and start fresh. Colors range from orange, green, yellow, pink. OEM stuff is pricey, but some swear by it.
Search the data base for coolants. Youtube is a great resource also for DIY.
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