Watch out for lack of traction!!
I know that in the M5 on snows, forget about flooring the gas pedal because I get wheelspin in the first 3 gears.
I once 'raced' an Audi TT but because of lack of traction on the dry but cold pavement was killed in the lower gears.
Mind you once I got into 3rd at 7000rpm it was over for the Audi!