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Low oil pressure starts from oil pump sounds like its blocked either in the pump filter or galleries in the enging. I would first call the dealer and check what filter system is on the pump which may require removal of the sump to replace or clean.
I would certainly not use a car with this problem as it could well cause engine failure. Try a good quality flush first and run the car for 20 minutes minimum on tick over. Remove and put a good quality oil in and do another oil change again if required a month later with a flush to make sure the gunge is out.
If this does not help do an oil pressure test and see what it comes out at checking the manufacturers recommended pressures. If you have changed the oil, pump filters and done a second oil change and still get low pressure then you may well have a faulty pump.
I would also check the oil pressure switch to make sure it s not giving a false reading. The loss of power sounds like Turbo failure and again dirty oil to the Turbo oil feed pipes could be restricitng flow, hence why regular flushing oil and filter change is important.
I would get the Turbo checked out same time as on this model it could well be a Turbo and engine change if its gone that far due to the metal particles contaminating the engine.
I had a problem with "Unblock diesel filter and Anti-pollution fault". After reading a few answers for this I decided to take car into the mountains for a good workout. Usually my trips are short and often therefore the exhaust was not getting hot enough to burn off the diesel residue in the Particle filter. In 40 mins of 3,5000 revs mainly in 3rd gear nothing showed up on the computer. Think this problem is sometimes caused by the engine not getting hot enough for long enough.
Clean air filter, fuel filter and turbo filter. Check the inlet and outlet manifolds incl. EGR valve and Turbo gate. If there is particle filter then may be it is clogged. If its a diesel then open the injectors and clean it.