There is also low temp ie: -35 to -45 fluid with teflon or other additives in it - that I use only in the truck. I've used Olive Oil and Neetsfoot oil added to my WWWF, even a liquid soap, but stopped the soap - isn't needed - Taylor puts in Murphys in his WWWF as well, but some guys have trouble with Murphys - maybe looser combinations. He gets no 'brown' deposits - perfectly clean barrel with cold water cleaning - no added soap, either. LB puts some odd soaps and other stuff in his WWWF - works for him.
The oil isn't needed either, BTW, but I like it's slightly more slippery feel, I guess. I give the bottle a shake before pouring it over my patches (in a tin), let them soak for a while until saturated, then pour off the excess, squeezing them slightly, not much. I like WET patches. I use a Sucret's tin, or other metal candy tin. I've used Speer plastic bullet boxes, smaller sizes, but prefer the tins. The yellow plastic box is kind of hard on the eyes.