Hi lads,
I stock only Castrol products which i think are the best on the market,althougt they are a little bit more expensive than other brands,i stock four different grades,VW,FORD,BMW/MERC, and then magnatec 5W40.The 5W40 is the best oil for any diesel with a particle filter and will also supersedes 10W40 semi synthetic.
The reason i use castrol is for there brilliant customer care and lubricant helpline,which is available to anybody(not just their customers)
I also feel that with a branded product like Castrol customers dont mind paying a little extra for a quality oil.

Oil talk to yoy later !!!

Dave.

P.S.i am not an employee of Castrol