The Roewe RX5 requires 4 to 5 liters of engine oil, so 4 liters is sufficient. Below are methods to determine when to replace the engine oil for automotive diesel generators: Observing bubbles in a glass test tube: Use two glass test tubes, each with a diameter of 0.5 cm and a length of 20 cm. Fill one with 19 cm of new engine oil and the other with used engine oil. Seal both tubes and invert them simultaneously. Record the time it takes for the bubbles to rise. If the difference between the two times exceeds 20%, it indicates that the viscosity of the used oil has decreased significantly, and it should be replaced. Comparing colors on white filter paper: Place a drop of new engine oil and a drop of used engine oil on white filter paper for comparison. If the used oil drop contains many black spots, it means the oil has not deteriorated and does not need replacement. If the oil appears dark brown, it has deteriorated and should be replaced. Turn off the engine and wait for about 5 minutes. First, clean the oil dipstick, then insert it into the dipstick guide hole, and remove it to check. The oil level should be between the upper and lower marks to be considered appropriate. Choosing the right engine oil: Selecting high-quality engine oil can make your car more durable and powerful. Good engine oil, especially fully synthetic oil, not only protects the engine and reduces the frequency of oil changes but also saves on gasoline expenses.
