Technical Top rear right leaking

[Fiorino12]

yesterday morning I noticed an oil leak on the ground underneath the offside front. I traced it to a 50mm plastic pipe attached to the top offside of the engine at the rear. I’m guessing a breather pipe. I don’t have a manual so can’t identify exactly what pipe. I’ve owned the van since new 12 years and on the very few problems I’ve encountered I go looking for a repair manual it’s a lost cause so if anyone can suggest where to get a manual I’m all ears.
So 2 questions are
1. What the leak might be
2. Repair manual source

 

[the green vanper]

Hello,

putting the production year and the engine in the post would make it easier to help.

 

[Fiorino12]

Hello,

putting the production year and the engine in the post would make it easier to help.

2012 van 1.3 multi jet engine

 

[Fiorino12]

Also diesel. I checked the oil and water yesterday morning which were ok. So I used it yesterday as I thought the problem would be diesel related buildup.

 

[Fiorino12]

It done a 80 mile trip with multiple start stops without any issues.