I know this is way after the fact, but I thought I'd mention that redline's diff'l oil Comes with the ls additive already in there. There's no need to deal with that separate additive. I've had it in my Scout's powr-loc for over a year now and it works great, meaning great traction off-road, yet it never binds up or chirps when on-road. I'd say I'm much happier with it than I was with my old combo of mobil1 diff'l oil + the additive.