Ive not heard of a car with 89k needing 'the entire' cooling system replaced. expansion tank and pump, sure....what else?

You sure your indy isnt a $tealer in disguise? Gotta ask.

Your post took me to a large body of issue with 'not X5s' having these issues... I cannot recall seeing this issue every posted in the E70 forums.

Find a new indy that can do a head in under 24 hrs. or an indy that camn do it without a new head!

Sry, not much help....

Maybe time to trade it.