DPF filter, original or off market? And 2 more questions

I would do a reliable “Aftermarket” part and use a local mechanic that is well known.

 

Some parts are sourced through other companies, like NOx sensors made by Bosch being sold as an OEM part. They also might have changed their supplier due to backorders or shortages. I'm not sure how their parts fiche is set up, but I'd guess they put the sticker over it so that they can find that part in stock when they run your VIN. They may not be able to properly cross reference the manufacturer's part number to your part for whatever reason. I doubt it's anything nefarious.

There are some dealers who just want to extract as much money as possible from you. There are some that treat you fairly and want your repeat business. I've had better luck with independent shops for Volvo, but I don't know if the same rationale applies to Kenworth. The important thing is that you trust the person doing the work, and that they have the tools to perform the job properly.

How did you determine that both filters need replacing? Did they fail the pin test or flow test? Are they melted or contaminated? I usually pull the filters and run them to DPF Alternatives, who have shops all across the country. It's usually a 24 hour turnover, and they clean and test them to make sure they are within spec. If it is out of spec, I would replace it at that point. If you're getting high soot levels, there are other causes besides the filters being blocked. You could be getting bad readings from faulty electronics or wiring. There might be something causing a lack of pressure before the filter, or a blockage in the exhaust somewhere affecting the flow rates. I would hate to see you spend a few thousand on new filters and not have the problem fixed.

 

10 years old filters definitely need replacement. I would stay away from aftermarket because there no way you can see or somehow check quality of the filter. How much precious metals is in new filter if any at all? For slightly less money you will get useless ceramic.
Stay with OEM.