Is there a standard place where the neon leak motor oil out, I can not find the size of the machine base is oil

 

Lol. What?

 

I'm going to take a shot in the dark about what is being asked and say the oil pressure sensor.

 

I see your in Finland, so are you asking about the size of a sensor that's leaking oil, like the camshaft sensor, or the oil pressure sensor, that's a common cause of Neon oil leaks, as darthroush suggested?

If your asking about the size of the socket to remove the oil pressure sensor, there is a special, deep/long socket, that has to be modified off center internally, to clear & fit over the oil pressure sensor electrical connector & have the socket hex engage the sensor hex. The sensor & maybe the removal socket, is available on line from Rock Auto, or the like, for delivery world wide.
It will fit over the sensor to make removal easier. It typically has a 3/8 inch = 9.5mm square drive hole for a wrench & some also have a hexagonal formed end for a large socket, or wrench to fit on the end of the socket, to aid in loosening the sensor for removal.

I purchased the modified socket to remove my leaking oil pressure sensor.

The hexagonal size of the sensor is 1 & 1/16 inch = 26.97mm, so a 27mm wrench, or internally modified 27mm deep socket could be ground out internally to clear the sensor electrical connector & be made to work.

More thoughts for consideration, let us know if this is the information your seeking?

 

I just used a 1 1/16" deep socket to remove the oil pressure sensor after I removed the connector.