Having an over-cooling oil cooler setup makes this stuff a lot worse. The thermo sandwich plate can only do so much, esp in the winter. Blocking off the oil cooler helps a lot. This winter I went with an ugly but effective solution: for non-track driving, I just blocked off ~3/4 of my front grille with rows of black duct tape, and put on my front license plate (that Stillen one in the tow hook adapter, blocks air).
If I'm not in a rush, and the car's been run the previous day at least, I always wait for the idle to come down to normal-ish (less than a minute, but never timed it), then back out of the garage, then I'll usually let it sit until the idle oil pressure gets down to around 40 psi (which is just a couple more minutes). Then I go ahead and drive to warm up the rest of the way, keeping an eye on the oil pressure gauge to guide how high I push the RPMs as I go (don't move the needle past ~90-95 psi).
If the car's been off for like a week and/or the car was sitting outside on a very cold night for some reason, I'll let it sit and warm up at idle for several minutes, usually long enough for the water temp gauge to reach the normal dot, sometimes even enough for the oil temp gauge to at least move off the bottom.
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