I've used it for years is all my vehicles / yard machines gas . Oil occasionally right before oil changes, never failed me. I worked with a guy 20 years ago , said back in the50's/ 60's his dad used it religiously, swore by it.
Nope, never used any kind of oil to actually clean up with. Warm soapy water or windex only.
I do run an oiled patch in the barrel after cleaning and drying.