I think, 0w-20 or any 0w-xx grades hybrid vehicles k liay nai hain?
Itni thin oil viscosity non-hybrid engine k liay nuksaan deh na ho? 
Inn vehicles k oil sumps kafi chotay hotay hain aur engine and its Oil sump jitna choota ho ga, heat dissipation utni hi mushkil ho gee.
As per my limited knowledge, for most of the 660-1000 cc non-hybrid vehicles, 5w-30 is the ideal and best engine oil grade for round the year.
May be 5w-20 winters mein city traffic k liay to theek ho, but still, not for highways and in scorching heat of summers! and still, not 0w-xx any way.