GL5 Cen-Pe-Co Differential FluidMeets & Exceeds Roxor OEM specifications, Cen Pe Co Lube is our fluid of choice. This is a 80w90 lube with Temp Tac. Temp Tac is an additive which bonds to the metals and creates a "coating", this is important for slower moving vehicles and vehicles that may sit for a few days. This is for 1 gallon as your Front & Rear Diff call for 1. 9 quarts each, so 1 gallon is all you need! GL5 Differential Fluid is a high performance lubricant designed