2 new problems....

[Drag0na5h]

There is a headlight retractor relay in your driverside kick panel. It's a little blue box labeled something like "headlight relay" and in there controls the flipping motion. Maybe it has gone bad somewhere on the circuit board and doesn't recognize to flip up both lights. Hopefully you can find one at a junk yard and check out if swapping that instead would help.

I had oil leaks too near the top of my engine. It was hard finding where because it had already soaked an area with oil. First one was coming from some PCV hoses that lead into my valve covers. When I took them off and looked inside and around it was kinda blackish and gritty like you described yours. So maybe it's normal build up. They were old and cracked hoses too. Then I had one because of my distributor o-ring had hardened and flattened out. Both easy to fix once I found out why. However I have a 7mge motor and not a 1jz soooooo not sure if that helps. But hoping to give you some confidence to keep searching.

As far as the brownish coolant in your system I'm hoping it's not due to any rust build up somewhere. Just be sure to always use distilled water and not tap. Then atleast you have more confidence that it wasn't because of dirty water.