Like we keep saying "Don't Mix"!!!
WHen I first got my 96 XP running, I went to the dealer and asked what oil to run, and he sold me the xp-s Mineral so I ran it. After a while (a month or two) I noticed less oil consumption, and found that the mineral oil was NOT what was supposed to be used, and when mixed with the synthetic that was in there, it turned to jello.
That ended up being a VERY expensive gallon of mineral oil, and a lot of work to clean the entire oiling system out.
Stick with synthetics.