Hi I have and 04 F-150 Lariat that takes 5w20. I changed the oil myself and added 6 litres. I checked the oil today and it was a bit low. I'm just wondering if I ran the truck low on oil for a week would it do a lot of damaged to the engine. I'm super scared because this is the biggest investment of my life so far I'm only 20 so please any help will do Thank You