Been into my local National Autocare centre and had an oil change today..
They say it is Castrol Edge 5W30 and I have no reason to not believe them..
Only thing I will say, is watch the paperwork !!
The reason I had it done is that have only just bought the car and the 3rd Party warranty (not Audi) states that I have to have an oil and filter change every 6 months or 6k miles.
To make it difficult, they also say that the invoice has to state my name, address, Reg num, mileage, and have labour and parts itemised separately, and have a registered VAT number on it.
Herein lies the problem with National if you book on line..
For a start, your booking confirmation page on the Internet is actually your invoice, but guess what, no name or address, no reg number, no mileage, no individually listed parts (just says Oil and filter) but it does have Vat number.
I discussed this with the geezer in National and he did print off an advice note which had my name, address of National Web site Sales (why?), reg number, mileage, but no VAT number, or Pricing information. He said that is the best he could do as I booked it online.
So, it would seem that the paperwork maybe borderline as to whether it will count towards the Warranty that I have..
If you are thinking of using National for a similar reason as me, please just bear this mind.
Other than that, fairly efficient service, I watched the job being done, deffo new filter, but OIl was from a giant jug, could of been anything !!