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old thread, i know, but i didn't want to start a new one for the same thing.
I just got an 06 6.0 a few days ago, and its starting to get chilly (not cold yet) in maine now (probably 20 degrees normally in the morning). I've noticed that if i just idle it to get it to warm up, it takes much more than 10 minutes to get up to temp, driving it will get there in 4-5 minutes.
I have been letting it idle for ~5, then driving it (although its still cold, aftermarket gauges say im circa 105ish, but its hasn't even registered on the stock gauge yet) and it warms up pretty quick from there.
After reading this thread im assuming this is normal, I just wasn't sure, and wanted to make sure my truck was doing its thing appropriately. I would normally assume stuck open thermostat, but when the temp starts to climb it goes right to its happy spot (~180-184f ECT) and stays there nice.
My gas junkers will warm up ideling pretty quick no problem.