75W90NS GL-5 Gear Oil - gallon, friction modifiers removed for improved synchro operation, for transmissions and transaxles like Subaru and Porsche, used in differ=tials where aggressive limited slip is desired75W90NS GL-5 Gear Oil - gallon, friction modifiers removed for improved synchro operation, for transmissions and transaxles like Subaru and Porsche, used in differ=tials where aggressive limited slip is desired