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Most likely the turbo or the turbo oil seals have gone.
If it is the turbo, then make sure that they replace the oil feed and return pipes to the turbo, as those being clogged up is what usually causes turbo failure. If the pipes aren't replaced then another turbo failure is highly likely in a few months.
That much extra oil being pushed through the DPF will probably have put another load of ash into that too, so the DPF may be close to needing replacement - especially given the mileage on the car too.
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