I use Motul 5w40 in mine...
Alot of people are probably going to recommend 15w50, but for normal everyday driving I think 5w40 or 10w40 is fine.
There's some good info on this website: http://www.opieoils.co.uk/technicalinfo.aspx
[quote author=B4 soon link=topic=11704.msg140622#msg140622 date=1231090641]
@ROB4-15w40!!!!!! thats tractor oil!¬!!!! I use mobil 1 15w50. Motul is just as good too. Or 10w60 castrol edge
[/quote]
:lol: :lol: It hasn't caused me any problems so far so I'm sticking with it!