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Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
You will want to use a good brand, (I personally prefer Penzoil) that meets reqirements for an API motor oil. (that would be any brand)
Being that the warmer whether is coming up, it is recommecded that use use a weight of 10W40. However, there is a product for high milage vehicles that is available from many of the major oil companies.
I have had a few VWs back in my youth, (lol) and I always used regular non-detergent motor oils in them and the result was many years of faithful service.
Synthetic motor oils are good if that is what has been used since the original break in period of the engine. I have personally never used any in my VWs and I have not seen any significant differences in the people that I know that have. I'm sure it wouldn't hurt, and may be worth the efforts, as it meets all of the standards that a crude oil does.
That may be a matter of opinion when it comes to synthetics.