I just bought a 2005 F350 with 190k miles on it. When I test drove it there were no signs of smoke. I drove it 100 miles yesterday after picking it up and saw no smoke. Today it started and drove fine first thing this morning but after running a few errands it would occasionally have white smoke coming out of the tailpipe. The smoke clears up on hard acceleration. Driving around the rest of the afternoon it would be 1 in 3 times that it would blow smoke. This was also the first day the temps got over 32*. My degas bottle looks great with no sign of coolant overflow. Any help would be greatly appreciated.