Volkswagen Golf GTI 2016, Owner'S Manual

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heed the WARNINGS →
Introduction
Additives are used to improve the quality of the gasoline.
Fuel quality impacts the operating performance, efficiency and
service life of the engine. Therefore, use high quality gasoline that is
already blended by the fuel supplier with suitable gasoline additives
that do not contain metal. The additives provide corrosion
protection, clean the fuel system, and help prevent deposits on the
engine.
Volkswagen recommends TOP TIER Detergent Gasoline. For more
information on TOP TIER Detergent Gasoline, please go to the
official Web site http://www.toptiergas.com.
If quality gasoline with additives that do not contain metal is not
available or engine malfunctions occur, you should add the required
additives while refueling → .
Not all gasoline additives are effective. Using the wrong additives
can cause significant and expensive damage to the engine and the
catalytic converter. Never use additives that contain metal. Please
note that metal can be included in some aftermarket gasoline
additives that are available to be added to gasoline during or after
refueling to help improve knock resistance or increase the octane