Guy, you are right that the French grade of Mobil 1 is differnt to UK spec.
IT IS BETTER!
5W50 is superior to 0W40 in that it has a wider operating temperature range. I think that a cold viscosity of 5 is perfectly suitable for the UK climate and 50 is the same grade as "Motorsport" Mobil 1 (15W50) that is available in the UK.
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