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Do not turn off DSC, you need it more in snow than in the dry. When you turn off DSC, you are in the DTC (Dynamic Traction Control mode). This allows slightly more wheel slip, and you lose the benefits of stability control.
The only time to turn it off is when you are starting off in snow or ice, and the throttle won't respond because there is no available traction. In that case you turn it off, and let the wheels spin while you get the vehicle moving, then turn it back on as soon as you are moving.
Don't lower tire pressures in snow.
What you really need are snow tires, but failing having the correct tires for the conditions, try driving it in an empty parking lot to see how it responds before going on the street.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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