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Sounds like they're on the right track, to be honest. Excessive regens can cause fuel dilution and an overfull crank case, but the injector can as well. If the oil is "way" high, that sounds more like a leaking injector or fuel line than too many regens. If there is a bad injector, it can take out (possibly melt) the piston/cylinder if not caught quickly enough.
I would think that the amount of extra soot that cylinder could be putting out (if the injector were bad) may back up the dpf, triggering the regens as well. I doubt it's a sensor in the exhaust, but if they want to replace them, I wouldn't argue.
If it were my truck, I'd want the cab off, injectors tested, affected cylinders inspected, & oil changed (obviously). If, after the repair, the excessive regens continued, I'd focus on the DOC and DPF.
Just my $.02.
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