Is it normal for oil to leak from turbo intake tube?

Yes, it can be normal for a small amount of oil to leak from the turbo intake tube, particularly if the turbocharger is equipped with a bearing design that allows for some oil to escape. This is often due to oil vapor from the crankcase being drawn into the intake system. However, excessive oil leakage may indicate a problem, such as a failing turbo seal or other issues within the turbocharger system, which should be inspected. If you're concerned about the amount of oil, it's best to consult a mechanic for a thorough evaluation.