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It does not have a cam belt. It has a chain like all bmw's which never requires changing
every 90000 miles
Every 4 years or 40,000 miles
Good Question
My handbook state's 60,000 but I think that is only with Genuine Parts
if its kept well oiled it should not need changing for the life / 200k miles
At the start, no you best not pick any diversified belt
there is a timing chain on the car no belt.
x5 have chain not belt lasts as long as the car
On a 2004 2.0 SE HDI 90 dealers states 90,000 miles or 10 years.
every 60000 miles