Would you be interested in some Shell Helix Ultra 5w40 at £5 per litre?
I've just spent ages researching the best oil suitable for my Audi A2 Tdi, BMW 530d, SLK 320 and BMW Z3 2.8. The most demanding requirement was for the A2 which is on a long-life service scedule (30,000 miles between services) and needs oil which satisfies VW506.00 as well as all of the earlier specs. I finally chose Shell Helix Ultra VX which was VERY expensive.
For the two BMWs and the Mercedes I chose fully synthetic Helix Ultra Diesel 5w40 which seems to be just about the best available. It satisfies all the standards specified by both BMW and Mercedes for diesel and petrol engines, including Mercedes 229.3, BMW (Longlife) etc. I was a little worried at first about using it in the petrol engines but my Shell supplier assures me that it is ideal for both petrol and diesels, despite being labelled as Ultra Diesel.
In the end I bought a fairly large quantity in order to reduce the price, so I'm trying to recoup some of my outlay by selling the surplus at £5 per litre or £22 for 5 litres. It comes in the original factory sealed 1 litre bottles.
Let me know if you would like some.