how to add oil to your car ?

[caretaker]

mate of mine (bloke) turned up with a very rattly fiesta. i asked him if he'd checked the oil. he lifts the bonnet, pulls out the dipstick and says "look, it's covered in oil." i told him to wipe it first. we filled up with oil but i wasnt hopeful. he drove 40 odd miles and his engine died. not just the girls...