Q: Jdm bg5 ej20 twin turbo boost issues

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My friend was driving his bg twin turbo legacy the other night and the check engine light come on he continued to drive it for 2 days until it didn't boost any more. I had a look at the codes were 66 and afm. The code 66 was a vacuum line had come off the secondary blowoff/bypass valve and I changed the afm and reset the ecu this didn't solve the boost issue so I told him to take it to the mechanic. The mechanic couldn't diagnose the issue and now smoke is pouring out of the exhaust and there is a lot of oil in the intercooler. I am wondering if the primary turbo is gone and needs to be replaced or could it be something else

My car has 220000 miles.
My car has a manual transmission.

Oil in the intercooler is generally a sign that a turbo seal has let go. Most likely one or both turbos are due for replacement or rebuild. Have a professional come look into the Check Engine Light code and smoke problems more thoroughly in order to get a more accurate handle of what you should do next.

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