Valvoline synpower, qt, 75w90, full synthetic gear oil, formulated for ultimate protection & performance, contains additives to assist in protecting gear teeth, maintains excellent low temperature fluid protection down to -50 degrees fahrenheit, -46 degrees celsius, outstanding thermal stability for cleanliness & longer service life, contains special additives to reduce chattering in limited slip differentials, recommended for conventional & limited slip manual transmissions where an api gl-5 or mt-1 fluid is specified, protects parts from rust & corrosion, compatible with conventional gear lubricants.