Muchmore Racing MMS55 #550 Weight Silicone Shock Oil 100% pure silicone oil offers a more constant viscosity than other types of oil and will not thin out in hot weather or thicken up in cold conditions INCLUDES: One 1.7 fl. oz. (50 ml) bottle of Much more Racing 100% Silicone Shock Oil #550 Weight. The higher the weight, the thicker the oil. Much more Racing 100% Silicone Oil is available in 15 different weights, ranging from #100 to #800, to fit your specific racing needs.