The valvetrain on the N52 introduced in 2006, used 5 mm valve stems on both
the intake and exhaust. To
increase durability, the exhaust valve stems were increased to 6 mm from 6/06
production.
All of the new NG6 engine have adopted the 6 mm valve stem for the exhaust, the
intake stem remains at
Principle
Depending on the equipment, some heating and
cooling functions can be automatically activated
depending on the outside temperature.
General information
The outside temperature at which the functions
are to be automatically activated can be set via
iDrive.
Activation is performed if the ou