This is all very confusing! was looking at getting Castrol Edge, had a look on the website at the FAQ's
Q Which is the replacement for the SLX Longlife II oil?
A. This is the EDGE 5W-30 - the Longlife oil was a 506.00 / 506.01 specification – you’ll notice that the spec on the EDGE 5W-30 is VW 504.00 / 507.00 – this is the latest VW specification for the Longlife oils and is backwards compatible; meaning it can be used where the 506.00 / 506.01 / 503.00 specification is required.
The EDGE 5W-30 is suitable for all Audi vehicles, and all VW vehicles that do not specify the 505.01 (fixed servicing), for which EDGE 5W-40 should be recommended.
but if i topped up with this then I would be adding 5-30 to 0-30 oil??
ARRGGGHHHH!!!!!