Why Is There Oil in the Intake Manifold?

[HaileyAnn]

Reasons for oil in the intake manifold: 1. Due to the condensation of engine oil vapor when it cools down, a small amount is normal; 2. Failure of the oil-gas separator, solution: clean the oil-gas separator or immediately replace the valve cover; 3. Clogging of the exhaust gas recirculation valve in the valve cover, solution: replace the valve cover. The intake manifold distributes air, fuel mixture, or clean air as evenly as possible to each cylinder, so the length of the gas flow channels in the intake manifold should be as equal as possible. To reduce gas flow resistance and improve intake capacity, the inner walls of the intake manifold should be smooth.