I have a Snapper ZT mower that I've had since 2019. It uses Hydro-Gear EZT 2200 drives. These are "serviced for life" units, but many videos of how to replace the oil in those. That being said, since I will change the oil in these units at some time, how many hours would be good on it for that change? I'm not worried about the time or trouble removing the units to service them, but like "serviced for life" transmissions, the thought of "serviced for life" and me being a member of an OCD group like BITOG requires I delve into changing this fluid. I am thinking, should I go ahead and do it this now, while the unit has low hours, or wait till it passes 100 hours or so? Thoughts?