Valvoline SynPower, qt, 75w140, full synthetic gear oil, formulated for ultimate protection & performance, a thermally stable, extreme pressure gear lubricant, designed to operate & protect in both high & low extreme temperature conditions, recommended for conventional & limited slip hypoid differentials & is compatible with conventional gear lubricants, maintains excellent low temperature fluid protection down to -50 degrees fahrenheit, provides outstanding thermal stability for cleanliness & longer service life, contains special additives to assist in protection gear teeth from rust & corrosion, use where an api gl-5 or mt-1 fluid is specified.