[btimbit]

I just don't get it, it's such an old school mentality but you haven't needed to idle diesels like that for a long, long time. I've had several over the years. Sure diesels take longer to warm up, but idling them is worse than gas engines, they don't burn all their fuel at idle. Which can wet stack the cylinders.

People say "Well they need to idle for a while before being driven so they can warm up" and that is very true, but only to a point. A diesel does not combust well cold, same issue as I said above, but even worse since if driven cold since it's being revved high. Even though its not burning fuel very well at idle either, driving cold has worse fuel burn efficiency. While driving drastically reduces heating time, it also drastically introduces soot to the particulate filter. (Which is very expensive when it clogs) but that will continue to happen if idled more than it needs to be.

So it's all about balance. Does the truck need to idle for half an hour? Hell no. Even if it's -30, 5-10 minutes is plenty.

The only other time a diesel needs to idle is after being driven hard. Say, towing a trailer. If you just shut it off right after stopping the coolant and oil stops flowing, which are both used to cool engine parts, like the turbo. If that stops flowing then something like the turbo isn't getting cooled, all that heat is soaking. So in this scenario it needs to idle a bit before being turned off. But again, we're talking a few minutes, not the 45 minutes like some idiots.

People just still have that old school diesel mentality. Back in the day, yeah, they needed to idle. The last 20 years? Not so much. do they need to idle more than a gas engine? Yes. But not much more. Minutes, not hours.

These are the same guys that complain about emissions control systems failing, and costing them money, so they're taking them out instead. Of course your DPF clogged you meathead, you treat your truck like ####