its under the passanger box, few screws and airbag connector you need to remove

if you are not in winter conditions you dont need 0w-20, fill only what's inside spec manual of your car

soon im going to change coolant completely because it changed color little bit and its missing somewhere, probably leaking ... on corsa F manual it says that you should only use lobrid :roll: antifreeze. well asked a few mechanics and they all want to put inside yellow coolant inside but the reality...