Engine breather?

[ToadHill]

I just finished another oil change on my DK35 and noticed a orange rubber plug near the oil dipstick tube. I pulled it out and found a hole into the engine, anyone have any idea what it is for. I can;t find anything about it in the manual.

 

[mrutkaus]

I would put it back in.

Mike

 

[Highbeam]

I would also put it back. Maybe that's the turbo oil return bung. Maybe you could use it for one of those fancy bypass oil filtration units from amsoil. I suspect that these engines see many uses outside of our tractors so they have to allow for application specific plumbing.