Shur Lube R/C Lubricants. The original colored silicone lube. The most popular R/C lube on the market. Six different viscosities to choose from---#1 is the thinest and #6 is the thickest. Color coded and numbered. Excellent for use on diffs,(most popular diff lube for oval racing) damper tubes and anywhere else on your R/C car needing high quality silicone lubrication.