Some Xs eat it, some eat it and then lose their appetite, some don't
use much or, any.
You didn't say how many miles you had done since the bobber was
known to be full up.
My '01 used to consume it pretty good, esp. on road trips; now,
it barely sips it over thousands of miles. I guess the seepage
sealed itself up, or it gave up leaking.
If one took a poll here, I suspect there would be a reasonable
percentage of X owners, esp. the E53, that have/had some
coolant usage. Keep an eye on it...
These cars are not your father's Oldsmobile.
GL,mD