Volkswagen Golf GTI 2016, Owner'S Manual, Page: 526 / 1341

Follow the installation instructions provided for installing the roof rack system. Always
Installing or using a base carrier or roof rack improperly can
cause the entire system to fly off the vehicle, causing accidents
and injuries.
Always follow the installation instructions provided by the
manufacturer.
Use the base carrier and roof rack only if they are undamaged
and properly installed.
Secure the roof rack base carrier only at the attachment points
shown in the illustration → Fig. 105 or → Fig. 106 .
Always install the base carrier and roof rack properly.
Make sure that all bolts and fasteners are properly installed
and properly tightened before every trip and retighten them as
needed after driving a short distance. During a long trip, check
all bolts and fasteners at each stop.
Always properly install special fixtures for items such as
bicycles, skis, surfboards, etc.
Do not modify or repair the base carrier or roof rack.
WARNING