Specifically designed for automatic or manual transmission assembly. Lubricates o-rings, gaskets, bearings, bushings, sealing rings, thrust washers, and seals during assembly. It’s unique blue color prevents misdiagnosing leaks. Trans Prep will not melt at shop temperatures up to 135 degrees, & is formulated to dissolve quickly at operating temperatures, therefore not clogging filters. Trans Prep is compatible with all transmission fluids.