Starting procedure with the SmartKey
To start the engine using the SmartKey instead of KEYLESS-GO, pull the Start/ Stop button out of the ignition lock.
•► To start a gasoline engine: turn the SmartKey to position 3 in the ignition lock and release it as soon as the engine is running.
•► To start a diesel engine: turn the SmartKey to position 2 in the ignition lock.
http://strategic-human-resource.com/The 
preglow indicator lamp in the
instrument cluster lights up.
•► When the 
preglow indicator lamp
goes out, turn the SmartKey to position 3 and release it as soon as the
engine is running.
You can start the engine without preglow if the engine is warm.
See also:
Under the Hood
The CLS500 gets a 302-hp, 5.0-liter V-8 that works with a
seven-speed-automatic transmission. The CLS55 AMG has a 469-hp, supercharged
5.5-liter V-8 that's connected to a five-speed-automatic tran ...
Wet roads
WARNING
After driving in heavy rain for some time
without applying the brakes or through water
deep enough to wet brake components, the
first braking action may be somewhat
reduced. You hav ...
Low outside temperatures
Do not use gasoline to refuel vehicles with
a diesel engine. Never mix diesel with
gasoline or kerosene, as this may result in
damage to the engine or fuel system.
Diesel fuel with improved co ...