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From the new Group Lotus website:
For the Elise 111R/Exige ‘Mk.2’/USA Elise:
These models have been tested in all climatic conditions likely to be encountered with Texaco Havoline Synthetic 5W/40 oil which offers advantages in ease of cranking, smooth cold running and fuel economy at low temperatures, in combination with good wear protection at elevated temperatures and at high engine speeds. However, if a car is to be driven on track at maximum effort, or in conditions or a manner likely to result in very high oil temperatures being achieved, the engine oil should be changed for Castrol Formula RS 10W/60.