What leaks over the left axle?
 

As the title states...

I have a leak above my front left axle and don't know where it could be coming from. I can't see underneath the intake to know what could possibly be weeping. It's pretty serious also.

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Are we talking oil?

^^If so, it's most likely the oil filter gasket on a 3.0i - assuming you have a 3.0i since there's no mention of which X you have.

Probably 3.0i...

It can be:
- VANOS line
- Oil filter housing gasket
- Crankcase pressure control valve
- Transmission oil cooling lines
.
.
.
Or all 4 like in my case. :) You will find plenty of guides on the forum as these are very common problems, luckily cheap to fix if you DIY.

It is a 3.0 motor. I believe it is oil, as it doesn't look like it is coming from the differential.

The oil filter housing gasket is more front and center, no? It was my first thought, but I took off the airbox and tubing, and couldn't see the housing itself.

Is my best bet to take off the intake manifold?

No need
Remove the front under belly pan, and look up.
The alt/oil filter housing leaks start at 80 k and only get worse.
Power steering leaks also show their ugly heads at this time.
Look before you guess

Thing is I did that already and couldn't see anything. Maybe I'm just stupid, but the plastic belly pan and the metal pan both came out, still didn't see anything.

any of the ccv hoses broken? there is a small line that connects to the dip stick, its been known to break and leak oil.

Felt around and didn't find any. Then again, I hate how little space there is down there. Couldn't see anything from below, and definitely can't see anything from above. The only reason I know there is a leak is that I degreased the bottom and cleaned the metal pan, and now there is oil on top of the metal pan that is definitely new.

If you have oil in the metal pan you have either a transmission leak or a rear main oil seal leak.