I also changed rear diff oil, mostly because it was an easy place to start. Oil was green-brown. No idea how long it had been in there. Just a little bit of light sludge on the magnet, no bits or chunks.
Then I moved on to the engine oil. This was actually kind of a PITA (messy) but we got it done. The truck is new to me so I pulled off the full covers to take a look at things, and to grease the front driveshaft. Noticed this unplugged plug, any ideas?
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Then I found this relatively fresh oil. Power steering fluid?
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Also, hard to see but it looks like grease has been flung out near the CVs.
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Would appreciate advice on anything you see here.