some years ago I worked with a guy that passed his test late in life and you could wright a book about his car repairs, after passing his test he bought a morris marina after having it some weeks he said it is a good car but a pig to top the oil up, he was trying to get it down the dip stick. His starter motor packed up so he went to the motor factors and they explained that the motor was on an exchange and he had to bring the old one in, when he went back to the shop the guy then explained he must take back the alternator refit that then bring down the starter motor. He then some time later said he had a blue oil light come on on the dash of the car but it only came on at night,