White smoke on the rocker lid

Hello, I tell you a problem that has emerged to a colleague in your van. It is an Opel Vivaro, from 2003, and suddenly, without any symptomatology or anything weird, it has begun to make a white smoke due to the return of the oil to the carter. This tube is next to the oil filling plug, on the rocker lid, and ends in the carter. For when the van is burning smoke by that tube, it is white and does not smell much to burned oil or anything. As soon as the van goes out the smoke disappears immediately. The van works perfectly, and the oil is not sorry with water or anything, it has a normal appearance. Well, if anyone knows what can be happening, I would appreciate a help, thank you

It is not burning the gas well and the vapor of raw gasoline rises up. It has problems with the corner first step are the spark plugs, second step the cables of the spark plugs, the third step of the initiation and fourth step the module of the inition

Hello, the smoke that passes through the tube, is the breathing of oil vapors, and it is normal normal, which is not normal to go to the atmosphere, you will have the creepy sleeve where the clamp squeezes, put it it is its place, without more. greetings