what type of transmission fluid for a 2013 Chevrolet Malibu
You shouldn't need to be adding any transmission fluid its a 2013. It has a 5 year or 100,000 mile drivetrain warranty. If its low or leaking take it in to a chevy dealership and have it fixed under warranty.
That information should be in the owner's manual. Read it as there is lots of good information there.