Not sure on the thinner oils idea.
With Aygos (my previous car) the "2012" models managed to get into the £0 tax bracket (measured on CO2) mainly due to the use of thinner oils - there were no other mechanical changes over the "2011" models which were in the £20 bracket.
At the same time owners of 2011 models who swapped to the 2012 versions noted an increase in engine noise. There were also some incidents of piston slap with one or two owners having their brand new engines replaced under warranty.
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[I]So long and thanks for all the fish.[/I]
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