RS5 Upper Intake Manifold Oil Seals?

[gregg3gs]

Hello All,

just remove the upper intake manifold to service my oil filter housing seals and I find oil washing into cylinder 3, 4, 5, 6.
Cylinder 1,4,7,8 are more covered in carbon residue.

Also looking at the intake manifold, it seems I get some oil passing and leaking through it. Thought Red Mist Racking had a thing on seals of the intake manifold... but can't din it.


Any thoughts?

Notice the top and bottom intake ports are black with carbon residue, and inner two are washed clean, with oil.



.. and for some close ups





Any and all input is appreciated.

[hahnmgh63]

My guess is it's all coming from the PCV system through the Intake manifold. Catch cans will help but maybe there's an issue with the OEM system letting even more oil by. We know RS5's Carbon up quickly, more than the 3.0t's, but like you said, that's a lot of fresh oil, enough that it leaves the clean spot. How do the valves themselves look?
https://forums.audirevolution.net/t/...atch-can/16547

[gregg3gs]

My guess is it's all coming from the PCV system through the Intake manifold. Catch cans will help but maybe there's an issue with the OEM system letting even more oil by. We know RS5's Carbon up quickly, more than the 3.0t's, but like you said, that's a lot of fresh oil, enough that it leaves the clean spot. How do the valves themselves look?
https://forums.audirevolution.net/t/...atch-can/16547

Thanks for that info.

Valves are coated as the ports are. They are cleaner in center bores, and have more carbon in outer bores.
My plan is to get a JHM check valve upgrade soon, and we will see what happens afterwards.

I'm potentially also going to do walnut blasting next time I open the top of the engine. This should allow for comparison of now vs. then.

[hahnmgh63]

My new/old RS5 engine, just installed 100mi ago has 27.5k mi.. I'm also going to go with a Catch can and/or the JHM setup. We'll have to compare in a year or so and see how each of us is doing. My S5 (3.0t) just hit 71k so it will be needing a Walnut blast soon.