my understanding is that, whether you are on long life or time and distance sevicing, VW has stated that long life oil should be used in all instances.
the handbook states that long life oil is spec vw504.00 or vw503.00
time and distance spec is vw501.01 or vw502.00
I have a litre of mobil 1 5w-30 which on the back is approved for spec vw504.00. I also have 4 litres of castrol edge 5w-30 which is approved for spec vw504.00
take a look at this link which should make things a little clearer -
http://www.opieoils.co.uk/c-742-vw-engine-oil.aspxclicking on the vw 504 oil takes you to various supplier options but all being 5w-30
my gti is being serviced tomorrow and I am promised that 5w-30 will be used and I am on T&D
hope this helps