L-631-S Synthetic Non-E.P. Transmission Oil is a superior quality transmission oil formulated specially for extended drain and severe service in heavy duty manual transmissions which require a Non-E.P. gear or transmission lubricant such as Fuller and Spicer manual transmissions calling for motor oil or mineral oil gear lubricants and the latest requirements calling for synthetic transmission oils. L-631-S Synthetic Non-E.P. Transmission Oil is an SAE-50 as called for in many transmissions and has excellent cold and/or hot weather stability for all season performance.