I recently completed the oil seal fix on my E320. I also had to replace the turbo (used off ebay). Initially still had no power, lots of DPF codes. A bottle of Rislone and 20 minutes of driving got the boost back but the DPF still throwing codes and needs cleaning.
Before I spend a bunch more money I want to try a simple cleaner like this that you spray into the sensor port.
https://www.amazon.com/gp/product/B07F3TK2TH/ref=ox_sc_act_title_1?smid=A35BBWF6GE7L48&psc=1
I'm having trouble determining exactly where the DPF is in this vehicle. See image. Can anybody help please?