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Used it daily for 4 winters on our E53; your E70 may even make
better use of the feature due to X-Drive and 6 yr newer tech
in your car.
On steep, icy/snowy descents, it allows one to descend in a slow
controlled manner that I could not duplicate w/out the feature, even
for a very experienced, long time "snow driver".
It is an unnerving feeling the first few times using HDC as you must
avoid the urge to brake, keep speed even, smooth and slow and
just let the 'puters and systems do their jobs.
In our '01 5 spd manual, it would work in 1st, but better in 2nd,
which allowed for less rpms and more control, imo.
Having been in Alberta a few times in winter, my suggestion is
to go find a steep descent empty road or ramp and learn its
capabilities. Then, when you need it, you won't be a novice and
will trust its ability to allow you to descend a steep road.
GL,mD
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