Nothing that sinister. Havoline products are common and apparently well respected in the UK, so it's what Lotus uses/tests/specifies.TurnTen said:"If Texaco/Havoline products are not available, an oil meeting the following specification should be used."
(Spec listed - 5W/40, API SL/CF, SJ/CF; ACEA A3)
I wouldn't be surprised if Texaco paid Lotus a fair amout of money to be named in the manual.
Although they do seem to indicate the Havoline coolant, they provide the info to what oil to use instead of the Havoline. Havoline is not necessarily the best oil, but it's what Lotus has used and verified. The fact that it's almost impossible to find here in the US, means that we have to find other oil to use. I used Castrol from my last change (the proper viscosity). I use Mobil 1 in my other cars and would readily use it in the Elise if it was in the proper viscosity and specifications.