Simple one - Which oil for 2012 Sigma 140 Supersport?

[kalibre46]

Myself and a colleague have been given the runaround from Caterham in terms of a straight answer, plus our instruction books don't have the exact car spec in them which makes me dubious as to use any of the varients in it. So I thought I'd ask you lot for a straight forward answer.

So, which oil should I be using in my 2012 Supersport (Sigma 140)? Plus for some extra bonus kudos, will this be any different for my mates 2009 Superlight 150 (Sigma also)?

Cheers in advance!

[kalibre46]

Thanks all. It's not a case of Caterham not knowing, it's the never returning phone calls as per usual!