OK cheers thanks very much for your advice that was very helpful
I think I'll stick with the 5w 40 Mobil 1
I'm sure I've seen you post on the Lotus forum SELOC before about oil? If so you can help me with another question - will the mobil 1 be suitable to use in my k-series S2 elise as it is fully synthetic? The lotus is due an oil change and I was thinking of buying the Mobil 1...