0w-40 is a grade which offers better cold start protection and quicker warmup, normal engines mien 5W-40 behtr hai, lakin hybrid ko less viscosity ka oil chaiaye hota hai, kyn kay wo baar baar engine start or stop hota hai, prius ka owners manual bhi 0W-30 specify karta hai
0W-30 is not available in mobil 1 and 0W-40 is better for the hot climate of pakistan, as 0W-30 was specified for use in japan where temp don't get to 40C, so use 0W-40 mobil 1 it would be best
hybrids also have tighter clearances in engine drivetrian so they need a low viscosity oil, so it would be best to get 0W-40, 0W-40 would give you better fuel consumption than 5W-40 too