I have a 03 X5 3.0 with 80,xxx on it and just bought some Bilstein HD's from BavAuto. I had a shop look at the car and they said the fronts have worn out and I should have the rears replaced as well. Anyways...is 7 years / 80K miles typical for struts/shocks replacement? I bought the Bilsteins because the Sachs are on backorder and I heard some good things about them.