Febi Coolant Antifreeze G12++ Violet 5L 5 Litres for Volkswagen VW

Should I use an oil additive?. TT Petrol Convertible 2.0 TFSI quattro 1984cc 147KW 200HP CCTA;CCZA. TT Petrol Convertible 2.0 TFSI quattro 1984cc 155KW 211HP CESA;CETA. TT Petrol Convertible 2.0 TFSI 1984cc 155KW 211HP CESA.

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