Originally Posted by Smurftastic
There is actually more strain on engine internals if you let it idle for 10 minutes than letting it idle for 45 seconds and then letting it warm up to 180 degrees while driving under 2500k the whole time. The more time the engine is cold, the more wear in internals - letting it idle for ten minutes may warm up the coolant a bit on a cold start, but even when the thermostat starts to open, the oil still isn't at operating temperatures.
I would love to hear your explanation on how this works. You're telling me an engine with no load is going to wear faster than an engine under constant load? You're crazy.