Mercedes-Benz 2008 M-Class Operator's Manual page 482

Place wheel chock (or another sizeable
object) in front of both wheels on the
side opposite to the side on which the
wheel is to be changed.
Changing wheel on a slight incline
Always try lifting the vehicle using the jack
on a level surface. However, should
circumstances require you to do so on a
slight incline, place the wheel chock and
another sizeable object as follows:
Changing wheel on passenger side
(Example illustration)
Place wheel chock (or another sizeable
object) behind both wheels on the side
opposite to the side on which the wheel
is to be changed.
1 Wheel wrench
On wheel to be changed, loosen but do
not yet remove the wheel bolts
(approximately one full turn with wheel
wrench 1).
Practical hints
The jack take-up brackets are located
directly behind the front wheel housings
and in front of the rear wheel housings as
indicated by the arrows.
Flat tire
481