shes DOPE.
also an excellent way to get carbon build up on the valves and pistons.
my gti, i let idle for 10-15 seconds until it settles down, then i drive keeping revs low by the time my gear box is warmed up, the oil temp/pressure should be at temp as well. usually 10-15 minutes of operating time i figure as i dont have a temp/ pressure gauge. coolant temp means nothing. but letting it idle to temperature is a bad idea and your oil temp will still be out of its optimal range.