Lithium grease formulations are best for metal-on-metal lubrication. It should not be used for lubricating plastic or composite parts, as the lithium may attack these materials over time. Traxxas white lithium grease is a good lubricant for metal bushings supporting metal shafts, as found in the XL-5 Slash, Stampede, Rustler, and Bandit models. It can also be used on the metal gears these models as well as their VXL counterparts.