Purpose and Function. Diesel exhaust particulate filters (DPFs) are used in all light-duty diesel vehicles, since 2007, to meet the exhaust emissions standards. The heated exhaust gas from the DOC flows into the DPF, which captures diesel exhaust gas particulates (soot) to prevent them from being released into the atmosphere.
This can increase the chance of soot blockages in your filter. Poor servicing and maintenance can also worsen this factor. Any poorly serviced DPF will fail much faster than one that is well maintained—the average DPF should last upward of several hundred thousand miles. Esnure you are using a good dpf service when getting any work done.

This process of regeneration refers to the soot being burned away with a high temperature in the Diesel Particulate Filter (DPF). The regeneration takes place automatically while we steadily drive the car, preferably on a highway. Most engines of a new car will actively regenerate DPF if the car is speeding above 40mph for at least 10-15 minutes.

Regeneration events occurring during vehicle operation are known as normal regenerations as they occur automatically and without driver knowledge. In general, the vehicle will need to be operating continuously at speeds above 48 km/h (30 mph) for approximately 20–30 minutes for a full and effective regeneration to complete
It's hard to say whether it will or not. If a new sensor results in a measured value of less than 40g, then the ECU might indeed allow it, and since a new sensor is recommended in any case, there's little to be lost by trying this. I'll also note that your sensor's offset is offset is -9.95 hPa. That's pretty high. A Minimum of $1,400 Saved in Total Cost of Operation. Owners can plan on buying two will-fit DPFs versus one Genuine Cummins product. At today’s prices, that would cost about $3,400 versus $2,000 for the Genuine Cummins DPF. That’s roughly $1,400 extra for the DPFs alone. Downtime, missed deliveries, reduced fuel efficiency and labor costs
how long should a dpf last? The lifespan of a DPF is very hard to gauge with many factors but expect a DPF for the average vehicle to last 50k kms+ from new. For the occasional city driver this maybe considerably sooner due to increased soot levels and the ability for the DPF to regenerate under normal driving conditions.
Duramax 6.6 has always been 15W40, 5W40 and for a little bit early on 10W30. The spec has always been for whatever the latest "Cx" spec was (CJ-4, CK-4 etc). The smaller Duramax's use lighter weight Dexos D spec oils. 06 LBZ 2500 340,000mi 09 LMM 3500 Cutaway 665,000mi 22 L5P 3500 DRW. All currently on road. 4m4Q.