Switching from fully synthetic oil back to conventional mineral oil is feasible, but it is necessary to follow standard operating procedures to avoid engine damage. Fully synthetic oil typically has a replacement interval of 10,000 kilometres or 1 year, while conventional mineral oil requires more frequent changes at 5,000 kilometres or 6 months. Therefore, the maintenance frequency should be adjusted accordingly after switching. Special attention should be paid to maintaining the oil level at the midpoint of the dipstick scale; overfilling can cause increased crankshaft resistance and oil burning, while insufficient oil can result in inadequate lubrication. It is best to prioritize oils that meet API standards. For vehicles equipped with turbochargers or high-performance engines, continued use of fully synthetic oil is still advised to ensure optimal high-temperature protection. The actual replacement interval should also be adjusted based on driving conditions; for instance, frequent short-distance trips or operation in high-temperature environments necessitate maintenance at 20% shorter mileage intervals.
