It says, heavy steering, Auto start stop no longer jolts, no need for
x5M/E70 compared to x5/F15/50i and definitely trade in E70 for F15.
I find steering light, I do not use auto start stop. Owners manual still says premature part failure possible for auto start stop function. I assume even with the HD starter and spark plugs on gas models.
http://www.caranddriver.com/bmw/x5#