2005-2008 offroads are not limited slip, no friction modifier additive needed
NO offroads are clutch type limited slip, only the 2009+ have brake actuated limited slip, no clutches... no need for friction modifier.
Trd sports from 2005-2008 have clutch type limited slips and need friction modifier added to gl5 and do not usually like synthetics from info gathered over the yrs. Mobil1 users thinking the "ls" tag on the bottle thinking that was good enough got chatter when doing tight turns. SOME said they had chatter with mobil1 with a tube of friction modifier. Easiest way to do this... use dino or semisyn, and friction modifier.
2009 to present offroad or sport or base dont have any clutch based limited slip, so no need for any friction modifier, use dino, syn, or semisyn.