Task: Question Answering
Input (English): Context: Anyway , my pop and uncle drained all the oil out and fixed Indy up right quickly . But now . I went to pick Indy up from the mechanic today ( the engine thing only got finished over the weekend ) and when I got there , there was a huge dent in the roof . Apparently Billy had the car parked on the street on Saturday and a branch fell on Indy . 
Question: What 's a possible reason they drained all the oil out ?
Output (English): Because the car needed an oil change .