I have a couple gallons of BMW coolant that I've had for several years. Probably 6 is my guess. Is it worth using, or better to buy some new coolant. Does it have a shelf life? I know I've used regular Prestone type coolant after sitting around for several years without issue. I wouldn't think it would break down like oil does.

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2003 4.6is - SOLD
2003 M5 Imola
2008 Mini Cooper S
2011 Mazda CX9