What causes a Skoda fuel tank vent system leak?

[Haven]

The causes of a Skoda fuel tank vent system leak: damage to the oil pan gasket or loose screws causing oil leakage; damage to the oil pan drain plug gasket, missing gasket, or loose plug causing oil leakage. Treatment method: For oil leakage at the contact position between the oil pan and the engine block, the solution is to disassemble the oil pan and reapply the original sealant. Precautions for oil pan seepage: Seepage is not a malfunction, but leakage should be taken seriously. As long as the engine oil does not decrease—it will not be judged as leakage but only as seepage. Other reasons: If oil leakage is found after changing the engine oil, the possible issue is: the replaced engine oil does not meet the original vehicle's standard specifications, causing the oil viscosity to be too thin and leading to the problem.