err, i hope u meant "shake" in the correct sense 
i've heard quite a few theories on "new car dun need to warm up",
but i've never really believed in it. unless i can convince myself
that engine oil can actually adhere to ur cylinder walls after
parking overnite, i seriously do not want to shorten my engine life
by taking off first thing after i start my car. research has shown
that the most engine wear occurs during start up when the cylinder
walls are almost bone dry.