Do the X5s have the h20 pump with metal impellor or the dreaded plastic one??? I have 60k miles and i'm thinking that the time is drawing near. Ur thoughts? I usually change the pump, tstat/housing, pullys, belts around 60k on my older bmws and the radiator and coolant tank around 100k.

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01' x5 sport w/ 58k miles
97' 528i w/ 101k miles
94' 325i vert w/ 75k miles
All white with beige int.