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that can depend - a little is expected from time to time due to things like temp change, so a little rust and coloring is ok HOWEVER, if you start to see alot of white gunk in it also, you probably have a blown head gasket or cracked head (this happened to my old ranger - 1990 2.9L with 190,xxx miles), but so long as it is only a little, I'd say your good to go
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