Powers1, hello again.

I have DIS Software with the Yellow Head Diagnostic unit. There are no code/faults showing through this system.

The problem has only happened when the oil was changed. Yes, I am familiar with coincidences...

I have put through some injector cleaner in case it was the injectors. No difference.

The exact issue is this (I hope i can explain it).
Accelerating from say a stop, or turning it to a street, it seems to rev ok and pickup speed, but without moving the foot off the accelerator, the revs start to come down (slowly) and so does the instant L/100KM needle and then when it changes gear, it seems there is no power there and you get a lunge forward, then it picks up speed again, but it just doesnt have the power and if anything, doesnt sound the throaty diesel it is. It seems the longer you drive the worse it is. For instance, within the first 20-30 minutes (city driving) it is OK, then gets progressively worse. There is NO exhaust evident when accelerating (like if it wasnt getting enough air, but as you know, I just changed the Air Filter).

I think thats the best way i can explain it.

I havent noticed any increase or decrease in fuel consumption. This oil has been in for 3000KM now, and I havent even need to add any oil. it is still "just below" the full mark, with correct testing (10 mins after driving it).

I know I keep coming back to this, but it was perfect before the oil change. I thought the 0W40 might be too heavy when hot for the turbo to function properly (restricting it somehow), but I dont know enough about Diesels or Turbo's.

If i take it to a specialist, they will just want to replace the Turbo saying it is at fault, and I dont want to be throwing dollars after dollars for them to find the issue.

Rob