Truck Repair: 2001 Volvo Cummings N14 oil consumption, turbo bearings, piston rings

Question
I have a 2001 Volvo with cummings N14.  I have seen many issues with the truck.  Recently, it started consuming oil and fuel like crazy.  Sometimes, I have to add up to 2 gallons while I only run 400 miles daily. I feel that there is less pressure, then I check the guage to find few drops left.  It does not leak at all.  Any input please?

Answer
An unusual sudden drop in oil level/ oil consumption may be due to a faulty turbocharger. The turbo bearings , shaft housing need be checked.
Furthermore, confirm if you have been having blue smoke emmission, in this case, you may need to re ring your engine or replace both liner and piston rings set,

Regards,