Oil consumption increase on Passat, engine code AVB, 550,000 km

Hello everyone,

I have a few questions: Is it worth sealing the crankshaft main bearings with a sealant at a mileage of 550,000 km? Surely the crankshaft bearings have already worn in by now. How can I test the PDE? Perhaps the tandem pump on the shaft is also leaking.
I wanted to order the replacement parts for the PDE system from a local Bosch service center, but the manager was very unhappy. He said that only a Bosch service center located 40 km away, with its expensive €50,000 testing equipment, could install the parts. He can only sell me complete PDE units. Should I just reseal the PDE?
I read an article by the boss (Rainer) that says you should address the PDE before any demolition work.
and it should be tested with VCDS after installation, but I can't find it anymore, what should I do?
I need to enter this information in the search field. Thank you in advance.

I wish everyone a happy start to the New Year.
Wolfgang.

I would only seal the area where the tires make contact with the road.

Hello Ruedi,
Thank you very much for the tip. I'm just having a problem with oil consumption; the engine runs well, starts easily, and doesn't use much oil. The DPF (Diesel Particulate Filter) was retrofitted due to "environmental zone" regulations. If the tandem pump leaks at the shaft, diesel fuel could potentially enter the engine oil more easily than through the common rail system (PDE). Am I mistaken in my thinking?
Best regards, Wolfgang.