Hi, I am using a Nissan March (manufactured in yr 2000) which has run 127,000 kms. Recently an engine miss came up in the cold start. My mechanic removed the throttle body and found a lot of carbon built up inside it. He cleaned up the carbon and engine miss was gone... However when he removed the throttle body, I found some engine oil inside the air intake manifold. When I ask it from him he told that it's normal and is nothing to worry about. However, I am curious about the reason how the engine oil flows to air intake and is it a symptom of a much bigger problem... Experts in the forum, pls help me to solve this out... ☺️Thanks in advance....