thanks dest. the manual which I have is in finnish and nothing mensioned about this just few words explainging what the button is.
finnish winter is horrible and in city center streets are like glass so slipery and on high ways alot of snow can be even high. -30c our winter is. so we use "stud winter tyres"
I even wonder if esp on is ok or much better to leave the 4wd button always on.
I leave the ESP on and also use the 4 wheel lock on all but dry pavement in the winter. My driving isn't so much "in town" as it is slowing down for turns and stops. Some of the stops are completely iced over because of the other cars melting the snow and then it instantly turns to ice making for that "low traction" condition. Also there are numerous patches of snow, snow drifts and other low traction conditions. Since the 4 wheel lock "disengages"at about 30 mph or so I see no need to turn it off, it just goes back to the default AWD and will vary back and forth as needed. These use a viscous coupling and they are not as susceptible to damage being used on dry, hard pavement as are the transfer case type of 4x4 units.
Artificial intelligence is no substitute for natural stupidity