Well this year has been a huge learning curve in anything to do with cars, especially bimmers and I still know very little compared to what there is to know. But this whole year I was under the impression the entire 5er was built of aluminum panels, doors, trunk etc.

I also pondered how they usually tend to achieve a 50 50 weight balance realizing shifting the battery to the back and setting the engine as far back as they could wont do it-but wondered why.

Until I just learned the 5er is all steel up to the front section-the hood and paneling around the front and up is alum. Also most components in suspension is alum.

I guess I didnt know the 5er was still mostly steel

Still wondering how they achieve a 50-50 balance in the 550 with the v8? Where is the extra weight on the rear to compensate for this?