Quote:
Originally Posted by kortik
0w40 replaced w/5w40 its a BS
0w40 would be much better in terms of protecting your cold engine compared to 5w40
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According to your understanding.
It's possible that the 0W40 is too thin under the conditions that the Elise sees (oil coolers and all). Also, it fairly universally demonstrated that the broader the viscosity range, the more the oil tends to degrade over time. Either of these, or many other possible reasons, could be why Lotus is adamant about 5W40 synthetic oil. You can continue to argue as to which is better, but Lotus is on record that only 5W40 is acceptable for street use. Argue the point with them if you feel the need...
But hey, it's your engine, and obviously you know more about such things than the people the design high performance engines.