Divide the total amount of oil by the number of days.<br><br>
&bull; Oil per day = \( \frac{7}{8} \div 5 \)<br>
&bull; \( \frac{7}{8} \div 5 = \frac{7}{8} \times \frac{1}{5} = \frac{7}{40} \)<br><br>
Final Answer: \( \frac{7}{40} \) litres