Owner's Manual for the vehicle. With a quick reference ... - E38.org

180nJump-starting
Towing the vehicle
6 If the battery of the support vehicle is
weak, start its engine and let it run
7 Start the engine on the vehicle needing
the jump-start, and allow it to run
as usual. If the first start attempt is
not successful, wait a few minutes
before another attempt in order to
allow the discharged battery to recharge
8 Before disconnecting the jumper cables
from your BMW, turn on the rear
window defroster and set the blower
to the highest speed; allow the engine
to run approx. 10 seconds. This
will prevent a voltage surge from the
voltage regulator to the electrical accessories
9 Then disconnect the jumper cables in
reverse sequence.
Have the battery recharged if necessary.
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Tow fitting
The screw-in tow fitting is stored in the
onboard tool kit; be sure that it remains
in the vehicle at all times. This fitting is
designed for installation in the tow
sockets located at the front and rear of
the vehicle, and is intended for towing
on proper road surfaces only.
It should not be used to pull a vehicle
out of deep snow, mud, sand, etc. Always
observe all applicable towing laws
and regulations.
Access to tow sockets
Front:
Apply pressure to the arrow symbol on
the cover panel to remove.
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Rear:
Apply pressure to the arrow symbol on
the cover panel to remove.
Screw the tow fitting in until it bottoms
firmly. If this is not done, the
threads could be damaged.
Do not tow the vehicle by any components
of the running gear, or lash them
down in any way. If you do so, the components
could be damaged, leading to
possible accidents.<
Use only a nylon towing strap to tow the
vehicle, since the inherent resilience of
this material helps protect both vehicles
from sudden jerking movements.