Weeping oil from around the sump ?

Nissan micra k12 1.2 2005 , I have just noticed that oil seems to be seeping out of the seal type gasket and would like to repair it myself ? Would anyone know if this is a simple job ie just unbolt clean and bolt back with new sealent cheers for any help !
 
Do you have oil into the air-filter box?
Is it coming from the rocker cover?
Is it coming from the sump?
If it is from the rocker gasket, you can easily change the 4 of them
If it is from the sump, you need to investigate the problem. It may be piston rings, valves, the one-way valve on the pipe that comes from sump...
 
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