The volatility of motor oil is normal and common. In the laboratory it is checked with the Noack test. Therefore it is very important to periodically check the oil level between services and, if required, – to add oil. In order to meet all the requirements of quality the high-class oil volatility should be ≤ 13% (test Noack). But a simpler way to check the oil consuption is to compare the values specified by the vehicle manufacturer. Usually manufacturers write that the oil consuption “under normal conditions” is 0.2 – 0.5 liters of oil per 1000 km. If oil consumption is more than 1 liter per 1000 km, contact an authorized service center.