Hello, could i change the oil in transmission and differential? Dealer says, that is "lifetime fill" but my S4 is 10years old...and i thing that is time for refill....

My transmission is not works light, but it is fully worked. And differential sounds OK, but safety is the safety!

 

 

if its a tip then they it is a lifetime thing. They only change the tranny fluid if your having trouble getting into gear and or if its slipping. But yes you can do it. And about the differential that is also up to you if you want to do it. For both just make sure you use the correct fluid or s*** is going to be messed up.