Help a cummins guy out here, i know a little bit about the 6.0's but at work we have 3 2005 F450's and 1 06.....and every rear around winter time they start running like crap. we were told we were using the wrong antifreeze, so we started using fords antifreeze, we have had quite a few injector problems to date on all trucks, and today our truck ran like crap this morning, like a loss of power after shifting, then through the rpms it would get better, then at lunch we started the truck up to warm up and it poured white smoke out for 45 mins, and couldnt rev over 1500rpm whats the deal with these trucks....the dealership also said that we cant idle these trucks? wtf so we just start them up cold and go or what?
First, welcome to the ORG.
These trucks use an HEUI injector that uses the engine oil to fire them. Consistent oil changes are mandatory or you WILL have injector failures. The reason is because the oil breaks down much more rapidly due to it's use in firing the injectors. That isn't the only reason, but is probably the most common.
There is a flash from Ford to improve cold weather performance, called inductive heating. Usually the 05+ trucks already have that flash, but it's worthwhile to check it out.
The white smoke and rev problem sounds like a busted EGR cooler, which is another common problem for the 6.0L trucks. If you want to verify for yourself, you could pull the EGR valve and you will likely see some droplets in the intake manifold (or worse, you could see puddles of coolant).
Finally, these engines don't work well for idling for long periods of time. It cokes up the turbo vanes and gums up the EGR valve, resulting in poor performance. 10-15 minutes won't hurt anything at all.
Hope this helps.