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I use Redline 5w-40. 0w-40 will give a tad more power (tad more, you'll not feel it). Considering the Engine is made by Toyota and a Yamaha design and Lotus have not done anything to it at all mechanically, I have no idea why anyone would ask Lotus what oil to use -- suggest you contact Toyota.
I've had good success with Redline in various cars - $8/qt with 2000-3000 mi between changes. I can't say Redline is better than any other oil even non-synthetics, I just have no real world evidence that has shown Redline $8/qt to be better than Penzoil $2/qt. I've never had an engine failure that can be attributed to poor quality oil, and I've never ran an engine beyond 60K miles before I've rebuilt or replaced it.
But like I said, ask Toyota not Lotus.
Rob
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'07 Exige S (Track Pack & LSD) + EFi 550ci injectors + Mahle 9:1 + DRS Port + SuperTech Valves + Weapon R Header + 2.9" pully + TODA Clutch + FF Engine Damper + RLS IC + Greddy catch cans + opened roof slot + RTD brace + Milled steering arms + Larini 8" + FF air intake + Moroso oil pan + Ultradisc 2 piece front/rear + Reverie 1650mm wing + ReVerie front splitter + IQ3 Dash + 4pt ASM + Pioneer AVIC-N2 nav + rear camera + RAC monolites 888s 195/225 + Lotus LSS Hoosier R6 205/225 @ 1921 lbs
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