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Part of the problem is the Positive Crankcase Ventilation (PCV) system sucks oil into the turbo and into the entire intake tract after the turbo. You will see traces of black oil where the rubber boot meets the aluminum pipe to the intercooler. This oil eventually allows the boot to blow off. Hasn't happened to me in 120,000 miles, knock wood. GM finally fixed this on the 2017s with an efficient air-oil separator on the pcv system.
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