Got oil in your throttle body?
 

I think I finally figured out the problem, or maybe I didn't and I started a useless thread.

Hey at least I'm not asking where my battery is located.

My theory...

Failed oil injectors could be the cause. The check valve is damaged causing vacuum pressure to constantly suck oil up into the intake.

This is assuming that you are still finding oil in your TB and accordion after you put a filter on your breather tube.

Thoughts on this theory?

usually overfilling is the problem

Yes I'm aware of that which is why I stipulated "after you remove the breather hose".

Do you know how the injectors operate?
If so... you'll realize how far fetched this theory could be.

1) What check valve? The one in the injector or are you referring to check valves on the vac hoses?
2) How can oil be "sucked" into the intake?
Only hoses that are on the vacuum side of the intake are for the solenoids (VFAD, AIR, SSV, VDI) and brake booster.

I'm assuming you're referring to the hose that routes to the oil injectors from the accordion tube.
If so, have you seen oil in THAT particular tube... and on both sides of it?
Only then would your theory be worth even considering.

If you (or others) find oil in the hose and at the inlet to the oil injector "manifold"...
Attachment 158129
then I can see some parts of the theory being true.

I repair and maintenance glue dispensers and have seen glue wind up in the air cylinder (its a pneumatic pump).
Though the way these operate is different than the oil injectors (glue dispensers use a piston while the oil injectors use pressure generated by the MOP to push the injectors check valve), I can visualize how this might be plausible.

I really do try to think outside the box instead of bashing an idea completely.
So here is what you would need to know that the oil injectors are the culprit.
1) Find oil in the hose that routes to the injectors/manifold.
2) Find oil in the manifold.
3) Apply a vacuum pump to the top of the injector and see if vacuum holds.
If the injector can hold 10inHg the nozzle is fine.
But if vacuum drops... you know there is a leak and a possible way out for the oil.

If you can find that... then you're onto something...

Correct the hose from the accordion to the oil injectors.

When the oil injector fails the check valve fails allowing air to flow both ways meaning oil can flow both ways.

Since I have fully functional injectors now I cannot test this.

Ill need to check that hose again.

Maybe there is some residual left in the line.

Nope no oil... Oh well at least there was some thought process behind it.

A spring pushes the check valve back up to seal the oil from entering the engine.
If the spring didn't return the valve, residual oil still in the injector would/may just get sucked into the engine.

but if you can blow and suck on the injector (faulty check valve) wouldnt that mean oil could flow both ways?