That substance is not oil...at least not "oil" as you and I think of it.
It used to be oil at one time, about 50K miles ago probably. But the owner left it in the engine for so long that it is has become something else entirely...it's more akin to road tar mixed with gelatin than motor oil when it gets to that point...it's definitely not oil anymore though.
I've seen a couple engines like that in the wrecking yard I used to work in. The cars/trucks were scrapped due to bad motors, and we'd pull the motors to see if it could be salvaged and sold for parts. There were a couple that had gelatinous gooey masses in their oil sumps where the engine oil should have been. You could tear chunks off and bounce it on the concrete even!
Every time it was due to the owner either not realizing they needed to change the oil on their new cars (usually lasted about 50-70K miles before giving up), or doing something stupid like using old, used engine oil from another drain on their current engine's drain and fill...then leaving that oil in waaay too long, even for a new oil. Same result - oil quit being oil, and the engine parts responded accordingly.