What gear oil

[Rawze]

So my truck had a bottle of pukas in the side-box that someone gave us a long time ago. We were using it to pour onto the fifth wheel instead of grease. We use crapy oil instead of grease on the fifth wheel most of the time because I don't like the nasty grease buildup. - We cleaned out the side-box a few days ago and sure enough, like everything else in the side box that sits in there long enough, it was seeping out of the bottom of the jug and getting all over everything.

It had seeped out and there was this really nasty residue left over. It was like melted rubber or something and nothing would take it off. The only thing I could figure is that it was the olefin polemers that are added to the oil that has gotten left behind.

The stuff was dark blu-ish green and like a half-melted, gooey, sticky like glue, and strechy like melted rubber. Not gasoline, not oil, not anything would take it off. WD-40 seemed to help the most but even it would not dilute it properly. I would hate to think what mechanic would be cursing if deposits of that stuff were to be inside someones engine. I would hate the thought that sh$it goo would end up blocking a cross-channel somewhere to a cam lobe.

Sorry, but I am not having something like that in my engine after seeing this.