PennGrade 1® Classic GL-4 Gear Oil SAE 80W-90 is intentionally designed for classic manual transmissions and driveline components requiring GL-4 protection.
Formulated to protect brass, bronze and other yellow metal components commonly found in vintage transmissions, it delivers dependable lubrication without compromising synchronizer performance. Built for enthusiasts restoring, preserving and driving classic vehicles, this formula helps protect the heritage machines that deserve the right lubricant.
