The Red Line Synthetic MT-90 75W90 GL-4 Gear Oil is a high-quality manual transmission fluid designed for vehicles requiring a GL-4 rating. With a viscosity of 75W - 90, this gear oil provides excellent lubrication and protection for gears. This product comes in a 1-quart bottle and is backed by an unspecified length warranty, ensuring peace of mind for the user. The Red Line brand is known for its reliable automotive products, making this gear oil a dependable choice for maintaining optimal performance in manual transmissions.