Hello.

I have an Corolla from 2017, 1.6, valemantic, 132hp, 45.300 km on ODO. I bought this car second hand, from Germany.

Recently I've made oil change - 5w-30 they put me. They said that this is the correct oil viscosity for car age and km on ODO

I've seen that the owner manual preferred is 0w-20. I can used  5w-30, but after that to switch back to 0w-20.

I'm living in Romania. Temepratures during the winter can go to -10 Celsius, to +35 Celsius in the summer

Theoretically, they put correct oil for these conditions, but owner manual is recommending something else.

Questions and concerns:

They put the correct oil after all giving weather conditions?

If I have right now 5w-30 it will affect my car?

Should I switch back to the 0w-20 at the next oil change?