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Check the MAF sensor KOEO KHZ reading, compare it to one on a known good truck.
Do you have an aftermarket exhaust/intake by chance?
Most of the time the only reasons I see for frequent regeneration are MAF sensors having "in range failures", which in turn causes excessive EGR operation, or, the sensor's reading itself screws with the air in vs. air out relationship between the DPF pressure sensor (air out) and MAF reading (air in).
Or again, back to EGR... A sticking EGR can cause this too, but will nearly ALWAYS set codes.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
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