Warm the engine driving or in the driveway?

[Bruce Wayne]

i think that's a valid point..

personally i keep mine at about 3k until the engine and gear box have warmed up. yes i may peak out at 3.5k when its warming up and dont want the revs too low and lugging the engine, but then neither do i want it too high putting wear, pressure and stresses on a cold engine and transmission.

500 rpm either way is not going to be a show stopper, but probably the guide is what both you and the car are comfortable with. if 3,000 or 4,000 feels better then so be it.

bear in mind also that the local environment will also play a part; if you are in Edmonton, Minnesota or up state New York in the winter or Texas, Florida or New Mexico in the summer, the oils, seals and metals will respond differently.