Driven a hundred or so miles to a mates house for the weekend and the oil light came up along the way. Was on the M6 at the time so stopped at the services as wasn't sure what the light was, and after reading the manual ended up putting 0.5 litres of VW 505 00 (which it says you can do). Now how long will it be before the light would come on again i.e. can it wait until Monday when i've driven home and can buy some VW 507 00 from the Audi dealership of GSF? Also do i definitely need to get VW 507 00 because the manual says about oil for a flexible service and a fixed service??