OS Giken Differential Gear Oil Fluid - 80W-250

Questions regarding our LSD and what fluid to use has come up quite frequent in the past year. We just want to provide users with information to help explain why OS-250R is important and why our LSD’s have a select few of approved fluids. OS-250ROS011-KA1Most diffs take 2 quarts Our differential is a Negative Preload Type LSD and thus our differential starts out with little to no locking until power aggressively applied. Because of this design it is critical that the right type of gear oil is used to ensure proper break-in and long term performance. If any incompatible oil or fluid mix (gear oil + LSD friction modifier) is used, the differential may not lock properly or may chatter and lock inconsistently. OS GIKEN OS-250R gear fluid is a specially formulated synthetic gear oil that contains the proper amount of gear oil and limited slip additive for LSD protection and reliable locking performance for our RWD applications (currently, OS-250R is not recommended in transaxle application