check the owners manual to see what viscosity of oil it recommends (like 5w-30 or 10w-40 etc etc) and if the engine requires an oil with certain quality classifications (ertain grade or rating), then off to your local auto parts store to choose the oil.
I would have thought that something relatively basic like Castrol GTX / Castrol Magnatec / Shell Helix would be fine for a 1.6 litre Golf. These oils will cost your $30-40 for a 5 litre container.
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