在我的2015 F150 4WD King Ranch中，100,000英里前後差速服務的重要性是什麼
The service schedule is defined by the engineers so that the oil does what it is meant to.
If you don’t change it and do another 100k then there may be damage or a failure.
But if you do change it, then it is part of preventive maintenance which reduces the liklihood of problems - never gets to zero though.
So, it’s down to you - do you look after it or not. Your choice.