Regarding the valuation part of Motherson sumi I would like to add that it always traded at premium because it has very ROCE ( 35% - 40% ), so obviously one has to pay the premium of such companies ( eg HDFC BANK, GRUH FINANCE,EICHER MOTORS, PAGE INDS ) to name few.
Also motherson sumi has always consistently feature in the Motilal Oswal wealth creation study. ( It has given around >30% CAGR growth ).