Removed charcoal filter. What I found underneath made me sick to my stomach.

i agree probably over oiled it. looks like someone at one time removed the charcoal filter, and ran the k+n. when they traded truck in put stock filters back in it or ran it without no filters. worse part of it is that dust has gone threw engine, valves, rings, etc. i would be checking for blowby. start it up removed oil fill cap or pvc

 

OK, first off, welcome to Tacoma ownership, and TW!

It is not just there in Washington. Anywhere a car is bought and sold for the most part can be sold as is, and it is your baby. Lots of smoke and mirrors about having a "cooldown" period, but that is just it, smoke and mirrors.

That being said, the dusting in the air inlets appears to be where someone may have driven it a short distance without an air filter (Again, I can't prove it obviously, but the appearance looks that way) As for the black tar looking substance that you are seeing down past the throttle body, that is actually normal, and anyone with say 30k or more miles on their truck will see this. It is carbon build up that is a result of normal engine operation, as well as the PCV system which draws bypass gasses and oil vapor from the crankcase and recycles it back into the engine to be burned (Reducing emissions and greenhouse gasses) So there is no need to panic. I can promise you that if you have another vehicle that is port fuel injected and you look past the throttle plate you will see that same black tar looking stuff. The best that can be recommended is to remove the throttle body itself and clean off the throttle plate(s) and the runner chamber of the throttle body itself. Trying to remove the entire intake and clean the inside will result in a LOT of work that will just result in rebuilding of this carbon. I have had to explain this to a lot of customers, and tell them that unless they are looking at racing their vehicle there is no need to clean this out unless the buildup is so severe that it is causing problems.

The carbon buildup does increase over time, but I have seen vehicles with over 150k having no performance issues or mileage losses due to this carbon buildup. It is up to you obviously, and if you would like to clean it out then here are my suggestions:

Get yourself a large water container that your entire intake can sit in and be submerged. Buy a 5 gallon container of Purple Power from your local parts store (Can be normally purchased for under $30) Remove intake manifold and remove all parts from the manifold to include sensors and any other electronic parts. Place intake manifold inside container, upside down, and fill container and manifold with the solvent. USE DISHWASHER GLOVES TO PROTECT YOUR SKIN!!!! The long ones that come half way up your arm. Allow intake manifold to soak for at least 4 hours. After 4 hours you can take a small drinking glass brush (similar to a toilet brush, but on a smaller scale) and scrub the ports and openings out. After cleaning it out, rinse with fresh water and allow to dry.

This will clean out 90% or more of the carbon/oil build up.

 

Looks about normal to me. Not an expert but Ive seen a few motors. If the dust is really fine and actually caked on I wouldnt be too concerned, original filter probably went a few without a clean. Oil and filters are designed to carry away and keep the worst out otherwise they wouldnt need cleaning and replacing.
Just sayin.....

 

I'd be tempted to send that oil sample to Blackstone for an analysis just out of curiosity...