oily plastic pipe on top of motor!

[njbray]

I decided to replace the power steering cap o-ring as it looks like it has been leaking.
I also noticed the oily mess on this pipe near the AOS. (AOS was tested about 2500 miles ago and was OK.) Any ideas where this mess comes from or is it just normal dirty engine grime? Also what is this hard plastic tube for? (I wiped off part of it & that's why it looks clean/shiny).
Thanks.

[njbray]

Aha! I think I have answered my own question. It is the oil filler tube! I guess I may have a leak at the top or bottom. I think there are some o-rings I can replace.

[clickman]

Mine looked grimy too, before I replaced it while doing my coolant tank. But I couldn't find any evidence of any dripping. I think it was just general engine grime.

[j.fro]

Yup, oil filler tube. They are famous for cracking in the "accordion" flex section. Not only does it get messy, but it also creates a vacuum leak that can lead to rough running and a CEL. Replace the whole pipe.

[njbray]

Thanks for the info. Replacing it sounds like a good idea. I hate having that messy area on an otherwise nice clean engine!
It looks like a pain to access.

[j.fro]

It is a pain to access, particularly if it still has the spring clamps. Once you get it off, replace the clamps with screw-type clamps. Your knuckles will love you for it.