Who are you guys?
2001 volkswagen golf engine oil
The "Time and Distance" regime has fixed service intervals, usually 15 000 km / 1 year.
"VW 501.01" - typically 10W-40 and usually semi-synthetic. I recommend up to 7 500 km, or a maximum of 6 months when using this oil.
"VW 502.00" - typically 5W-40 or 5W-30 and usually synthetic. I recommend up to 15 000 km, or a maximum of 1 year when using this oil.
VW don't make a distinction between service intervals and the type of oil used (blanket 15k/1 year intervals for both 501.01 & 502) but I'm personally not too sure that any semi-synthetic oil is capable of 15k.
Some change 502 oils at 7.5k, though I don't think a naturally-aspirated 1.6 16v MPI petrol engine would challenge a synthetic oil that much.
As for viscosity grade (30 vs. 40), on an engine that's 10 years old, I'd go with whatever it has used most of its life (probably 40).
Obviously, you don't have to use VW approved oils (warranty expired ages ago) but ensure that any oil you use at least meets "ACEA A3/B3".
The "LongLife" regime has variable service intervals, which is calculated by the computer depending on how the car is driven via various sensors. Ranges from 15 000 km / 1 year, up to a maximum of 30 000 km / 2 years, and anywhere in between.
The use of "Longlife" oils is necessary if running on this regime, such as "VW 503.00/506.00" or "VW 503.00/506.00/506.01" (0W-30, Longlife II) or "VW 504.00/507.00" (5W-30, Longlife III).
You are free to use such oils even if the car is not on the Longlife regime, but I don't think it's worth it for your particular application.