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Hello, I am Jose Sebastian. Your automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
Dear customer it is quite possible that the turbo has reached the end of its life and should be replaced but before we do this there are other checks we need to make, turbos can be disassembled and checked normally when a turbo fails it is because the shaft has worn out, but also most turbo failures are because the gaskets from the turbo to the engine are damaged causing vacuum leakage at the intake.
Dear customer, if there is oil in the intercooler this is very important because it is probably one of the seals of the turbo system and indeed it is the oil that goes to the exhaust so the dpf can also be clogged with oil.
I hope this info to be helpful, my goal is to give you the best advice i can, I hope to be helpful, if you have any doubt or want to know anything else please do not hesitate to reply back.
Kind regards, Sebastian.