What should I do if the POLO in 2003 burns a little oil?

For the question you asked, you can check the engine oil burning: if the exhaust pipe emits blue smoke during normal operation, it may be that the valve stem is excessively worn or the valve oil seal fails, resulting in the oil in the valve chamber being sucked into the combustion chamber, and the oil enters the combustion chamber with the combustible mixture through the intake pipe; If blue smoke is emitted from the exhaust pipe and pulsating blue smoke can be seen at the oil filler, it can be preliminarily judged that the sealing effect of the piston connecting rod group is not good. The piston connecting rod group has problems such as excessive clearance between the piston and the cylinder wall, small elasticity of the piston ring, locking or butt joint, and excessive end clearance and side clearance caused by piston ring wear, which leads to oil pumping of the piston ring. For a car with 1.3 million kilometers, a simple solution can't solve the problem. You must first determine the specific fault location, and then you can carry out maintenance according to the symptoms. Check the oil when the car is hot. When the water temperature is required to be at normal temperature, wait for 3-5 minutes after turning off the fire on a flat road. Pull out the dipstick, clean it first, and then pull it out to check the oil level. If you don't clean the dipstick, it is difficult to see the oil level accurately. The upper and lower limits of engine oil are marked on the dipstick, and the liquid level is preferably one third lower than the upper limit. As for the problem of hot air at the air outlet, it may be because the air conditioning cycle mode of your vehicle is placed in the external cycle, so when the vehicle is driving, the hot air in the engine compartment will enter the cab through the air filter. I suggest you adjust to the internal loop and try again later. If it can't be solved, I suggest you check whether the damper in the air conditioning duct can't be adjusted to the internal circulation mode. I hope my answer is helpful to you.