when I purchased the f60 all4 1.5t, the dealer told me that the all4 is working for up to 120 km/h and then is goes forward drive.
is this true; or is working on all speeds;

 

nobody knows?

 

Mostly true. At speeds above 120km/h or around 60 mph, the car is exclusively FWD for fuel efficiency. It can of course vary the power between 100:0 and 60:40 at lower speeds as needed.

 

ok for the fuel, but for the turns at high speeds;

all4 and xrdive is working on all models like countryman or in more expensive is working at all speeds;

 

Let me help you:

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The All4 system is FWD until slip is detected then sends power to rear. Good old Haldex system. l This is quite noticeable in the snow as the front will initially push with throttle. So at any speed it's FWD unless slip is detected. I'm not aware of if the system is deactivated above 120 kph though - not to say it doesn't.

When I drive the CM back to back with my S4 (permanent 60/40 rear bias AWD) the difference it very noticeable.