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Trouble C7

Good evening, I have a cat 140K year 2010, he is blowing white smoke through the engine breather, and he reissued valve guides, engine block, compressor, he changed rings, checked the engine liners. Bearings, even changed oil pump and pressure pump, but the problem persists, white smoke is still coming out of the engine oil nozzle. What I can do, changed almost everything, I only need to see the turbo, which advises me or which believes the problem.