XEP 80W/90 is an extreme pressure (EP) mineral based gear oil incorporating friction modifiers to protect the critical mechanisms of limited slip differentials. In addition to it's high load carrying capability, XEP 80W/90 will protect against rust and corrosion and has a low foaming tendency. Shock loading occurs when one of the driven wheels looses traction and the differential locks redistributing the drive equally. Standard API GL5 gear oils are unable to cope with this extreme condition and therefore it is necessary to use a proper limited slip differential oil to promote long component life.