Red Line 58204-2PK Heavy ShockProof Gear Oil - 1 Quart, (Pack of 2) Greatest extreme-pressure protection with the lowest coefficiency of friction available. Provide gear teeth shock loading protection as well as giving a thicker oil films between gear teeth Reduces temperatures dramatically Reduces metal-to-metal contact as well as gear noise Contains a unique solid dispersion which cushions gear teeth to help prevent tooth breakage and allows the use of lower viscosities.