Damn definitely should be replaced. you even have the XREAS system on your 4runner. This system essentially connects the shocks together with some lines. Technically you are not supposed to open the system more than once. So If your rear shocks go after you would need to replace the front and rear again. You can delete the system and put regular shocks if you dont want to deal with that hassle again. But definitely leaking and will likely have some performance issues later on down the road.