The Red Line Oil MT90 Manual Transmission Service Kit - 476455 is a comprehensive kit designed to service a car's manual transmission. It includes a variety of products that are essential for maintaining and improving the performance of the transmission. The kit includes a transmission fluid, a gear oil, and a friction modifier, all of which are specifically formulated to work together to provide optimal lubrication and protection for the transmission. Additionally, the kit also includes a drain plug crush washer and a fill plug crush washer, which are necessary for proper installation and maintenance of the transmission. This kit is suitable for a wide range of car models and is an essential tool for keeping a car's manual transmission running smoothly and efficiently.