Genuine Ford Fluid XL-3 Friction Modifier Additive – 4 oz.

The product is fine. Works as advertised but the smell is like hypoid gear oil on steroids!My rear diff has a dipstick which also serves as the fill port. Did the job outside, but threw the bottle away in the garage, along with a rag. Wow, the garage and first floor of the house reek, even with all remnants of the job bagged up in the back of the truck outside.Use caution!!