I have a 2008 6.4l, we are blowing white smoke. We have replaced the DPF, we have taken the EGR coolers off and had them tested by Ford and had pressure tests done to ensure that we do not have a blown head gasket. All computer testing passed including the compression testing, but we are still blowing white smoke. Most of the time the smoke occurs when you are first taking off, and when you are running between 35 and 40 mph, but it will clear up for a short time, but then starts again when you slow back down. we are loosing oil and water/coolant..... HELP!