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Any time you run and engine at consistently higher RPM like in Manual mode there is More Oil Vapor produced, and It seems the L99 PCV system has a hard time dealing with the additional vapor, Hence the TSB on replacing the valve cover and PCV line.
Al though this may help the issue, An Oil separator or Catch can will Prevent you from ingesting unwanted Oil vapor in to your intake Air Charge, and Smelling Burning Oil.
Ted.
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