I haven't changed antifreeze for four years, so I use less. Is it necessary to change it?

This is necessary. For example, the maintenance cycle of mineral engine oil, semi-synthetic engine oil engine oil or synthetic engine oil is generally 5,000 kilometers or half a year. For example, the maintenance interval in synthetic engine oil is 10000 km or 1 year, whichever comes first.

For example, 0W20 is suitable for Japanese smooth inner walls, 5W30 is suitable for European and American cars and domestic brands, and 0W40 is suitable for old cars with high viscosity. Mobil, Castrol, Shell and Total engine oils are recommended.

Antifreeze replacement

Just change the engine oil and filter the engine oil, Mann, Bosch, Mahler and Leopard King. Then check the cleanliness of the air filter and air conditioning filter element and replace it when it is basically 20 thousand kilometers, and add or replace consumables such as antifreeze, brake oil and tires according to the car condition.

When waiting for 40,000 to 60,000 kilometers, do major maintenance, replace the spark plug, engine oil and water, and clean the throttle, nozzle and three-way catalytic converter.