im not sure why you would need to change intercooler fluid unless perhaps way over 100k.
I get gearbox and center diff fluids as well... but again, 80k miles or more. Having had a couple of these X5s and an X3. The only issue I had was a first gen X3 center diff wearing out the plastic gear.
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2014 M6 Coupe (SG/Silverstone)
2017 X5M (LBBlue/Aragon)
2000 Z3M Roadster (EstB/Black)
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