StarFire full synthetic 80w, 140 gear lubricant is a multi-purpose lubricant designed for service in automotive and heavy duty applications. StarFire full synthetic 80w, 140 gear lubricant is formulated with synthetic base stocks and a sulfur-phosphorus extreme pressure additive package with friction modifier, which provides excellent thermal and oxidative stability, as well as anti-foam, anti-rust and anti-corrosion protection and have excellent load carrying capabilities.