Sprinkle Star, what does your daily commute look like and what region do you live?
Assuming a normal functioning car, gasoline will tend to build up in oil from normal blow by when commutes are short during winter because the oil hasn't warmed up high enough to evaporate/burn off moistur/fuel..
It sounds like since your stock tune, you don't have access to logs for fuel trims. If you don't have misfires while driving, no trouble codes, i wouldn't be too concerned. If you only have short commutes, I'd say you should try to get out once a week on a good 30+ minute steady state drive. It should burn off the normal amounts of moisture/fuel that accumulates assuming a correctly functioning PCV.