STP® Oil Treatment for Gearboxes is built to lubricate difficult-to-achieve parts which includes gearboxes, transmissions, differentials, back again axles and steering boxes in one straightforward application to help supply a smoother gear change. - Extension of service life. The gearbox additive really helps to keep a dense layer of transmission https://spencerwxyzh.blogitright.com/34274269/what-does-gearbox-oil-treatment-mean