u/angelicswordien

I am not good with cars, could someone explain to me in simple terms if this is ok or not:

Got an alert for the oil so checked it. Dipstick was near dry. Was visiting my parents and my dad had some spare oil 10W-40 that he's put in for now as he felt any oil was better than no oil

Google seems to indicate my car needs 5W-30. Do I need to take the car to a garage for a complete oil change as this seems to be the wrong oil or can I mix oil types

Wanting to send a parcel to a friend in Russia and just wanting to confirm Royal Mail can do this before I buy anything. The website says there's no current issues with posting there, but hasn't been updated for a while