Heavy is correct that DOC's can lose their platinum washcoat over time causing poor temperature rise. I would be getting the DOC/DPF apart for inspection and performing the snap accell test I suggested in my previous post. I would say given the application on a healthy engine and DOC/DPF you should be around the 20-25 engine hour mark for regen frequency. If it really is regening even once a day it is too often IMO. Do we know when or if it has ever been serviced?The regen history will tell a story of what is going on in the aftertreatment. Click to expand.Face plugging DOC and DPF soot blocked are going to be the result of the failing injectors if they are determined to be the root cause of all your troubles with the fuel dilution.
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