I am curious if you actually changed your oil? The pic looks a little bit like the transmission or transfer case and not the oil pan??
Yes, I actually did change my oil. The oil pan was, as one might expect, directly under the engine, bolted to the bottom of the engine block, and pretty easy to identify. And neither the transmission pan nor the transfer case look anything like what is shown in that picture.
If that is indeed the oil pan then it is the weirdest one I have ever seen. The drain plug looks to be in the corner of the pan?
Also, look above the drain plug. It looks like a fill plug?
I have seen many pans similar to this in concept, while not the majority of instances it is not all that unusual for the drain plug to be in or near a rear corner of the pan.
If the pan has a flat bottom, and the engine has a slight angle to it, the rear is slightly lower than the front (not uncommon), it makes sense to put the plug towards the rear of the pan, often a few inches forward of the back corner but I have seen them right at the corner before, or even on the back side of the corner. You see this less in front wheel drive vehicles, as their often transvers mounted motors tend to be level, but the majority of cars I have owned in the past 40+ years have been RWD or 4x4.
For example the oil drain plug on my 1962 Triumph TR4 is in a similar location, but on the drives side of the pan and forward an inch or two from the corner, and the oil drain plug on my 1999 Chevrolet Blazer ZR2 is as close to the rear corner as the physical shape of the pan allows it to be (an external strengthening gusset prevents it from being all the way back in the back corner).
What you seem to be taking as a fill plug is a mounting bolt.
A few comments on this new configuration, for those who do their own oil changes. The access hole in the skid plate is not cut back deep enough, and you WILL spill oil onto the top of the rear skid plate. Even if you jack the vehicle on the drivers side the oil flow, once it slows from its initial stream, will fall on the skid plate, not just a little, but a lot.
I don’t know how big an issue this was with the original pan, but with this configuration the hole needs to be cut back (towards vehicle center line) a lot more.
I used a small offset funnel to reduce this substantially. After removing the plug the oil flow is strong and extends out beyond the cutout in the plate, as the stream starts to weaken the stream starts to work its way back towards the skid plate, so I put the funnel in place, with the edge between the oil pan and the skid plate. End result was only a few drops on the upper side of the skid plate as I removed the funnel and replaced the drain plug.
T!