Nissan Titan rear differential oil change.

The Titan / Armada are sometimes advertised as having limited slip rear ends. They use the ABS sensors to detect tire spin and then activate the brake that is on the wheel that is spinning to "limit the slip". The limited slip additive is only required on a rear end that uses a mechanical system, since the Titan uses a electronic system it does not need it but won't hurt anything if you do use it.