Quote:
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Originally Posted by Ridgemanron
When Manhattan Motorcars changed my oil they
intended on putting in Mobil 1's 10W - 30. I was
able to get the mechanic to change it to a Mobil 1
40 Wt. and then found out he used 0W - 40 instead
of the (Lotus recommended) 5W - 40. Told this to
the Lotus Rep (Mike Fisher) and he said, 'the 0W in
place of the 5W is not a big deal.'
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The M1 0W40 oil is very good and is factory fill on various hipo cars. It dynos very well too. Remember that the first number is more or less related to the viscosity when the oil is cold while the second is when it is hot. So 0W40 and 5W40 differ primarily in their viscosity at a cold start up. Mike's point appears to be that when the going get's tough, both oils have the same viscosity rating and that since both are from "real" oil companies and are well made then you should be fine.