Hey guys, my first 4runner so bare with me. I was thinking about maintenance schedules. I am curious if you have the 4runner in 2wd drive does the transfer case still working?? So lets make believe you hit 20k and ready for fresh gear oil but in that 20k you never even drove in 4WD. Are you wasting fluid in the front axle and transfer case because they were never used? Or are they always spinning????