Lotus only recommends Havoline XLC, however Havoline XLC in europe is not the same as Havoline XLC in the USA (which has Dexcool). Dexcool is not recommended by anyone.
Lotus USA suggested people in the states use Peak Global Lifetime.
Its a toyota engine after all, thus toyota would recommend toyota red coolant (not sure if compatible with factory fill).
So unless you can get euro-Havoline XLC, take your pick between Toyota Red or Peak Global Lifetime.
I did a drain and refill with Peak Global Lifetime a couple of years ago, but last month decided to do a flush and refilled with toyota red. I was surprised at how long it took to get all the old coolant out of the system. Someone had a writeup on flushing the coolant out, and I thought I'd get most of it out in 3 or 4 drains. It took me 10 drains to get everything out, and I was using a small amount of positive pressure on the coolant tank to eek out as much extra coolant as possible.
Peak Global all makes all models or Prestone all makes all models. Car was born with Halvoline coolant.. Don't put the toyota red stuff. I just changed mine.. Huge pain in the ass!!!! Get ready to spend half a day bleeding the coolant.
I asked two dealers and got two answers, so I wrote Lotus:
Hi, I'm getting conflicting information from two Lotus dealers on a simple but important question: What brand/type antifreeze should I use for my 2005 Elise? I'm hearing - DexCool, Toyota's proprietary brand, and then others on the Lotus Forum. I just want to do what Lotus USA recommends. Can you help?
Just make sure it is long life coolant, as Dex Cool is, and that it has OAT (Organic Acid Technology) based corrosion inhibitors.
Director, Service and Parts Operations
LOTUS CARS USA, INC.
I don't know how you could recommend against the toyota red. Its a toyota engine and its what toyota recommends. If anyone knows the engine better than lotus, its toyota! I didn't know if it was compatible with the factory stuff, so I replaced it all. What good is the factory fill if you can't get it conveniently over here?
It would have taken me a lot longer if not for the airlift. I can do a drain/refill in less than 45 minutes with it. The problem is that you need to put enough heat into the coolant such that the tstat opens up and it circulates everywhere. I'd let it go 90 minutes before doing another drain so I didn't risk burning myself.