Cold Engine, Redlining it.

[particlewave]

Actually says that idling at start up to warm up is detrimental to engine.

[Ghostrider 310]

It says to start the engine and drive it gently (may not use that exact word) but the idea is to drive it to warm it up but not to treat it as if it's already properly warmed. I don't idle it to warm it up however considering how many of these are in LA don't tell me that they are not sitting in traffic overheating, idling maybe daily; which has to be worse than idling till warm.

[Topless]

Patience is a virtue. Warming 9qts of oil takes time. You can use a block warmer or reptile warmer to keep it ready to go but running hard while cold will surely cause rapid wear and possible instant engine failure. Warming the car while idling loads up the cats with soot and kills them.