Hi, sad to note the problem.
Oil consumption may be due to turbo failure,
Valve seal failure
Oil in coolant
Engine head leak
White smoke after 20kms of drive
Revving engine for 3k rpm, can generate white smoke denoting oil inside combustion chamber
Famous diagnosis is checking engine compression on all cylinders
Turbo fins visual inspection, fins must not shake if moved,
Too much oil in intercooler, more than 20ml if dripped
Best solution if under warrenty
Full engine replacement including turbo
Change turbo from spare car and check problem solves and change new turbo,
Else with compression readings, we need to decide weather pistons and block need to be changed or the engine head.
Black smoke is because of too much fuel inside chamber,
This may be due to many reasons,
O2 sensor failure or dust accumulation,
Injector leak or injector needs to be cleaned
Fuel pressure sensor taking false reading (worst case)
Egr needs to be cleaned
In neutral, if you rise, black smoke is normal
Try cruising in 3k rpm in 4th, check the smoke.
Oil issue can be diagnosed as per the instruction's I have mentioned above.
Hi, try using rustleak before unbolting, and cheers for taking , DIY
Regularly cleaning injector and pipes keeps the intake clean and keeps cool and increases performance