Permatex dielectric tune-up grease is a silicone dielectric compound whose dielectric and lubricious properties facilitate and improve tune-ups. The compound prevents voltage leakage around any electrical connector thereby insuring a strong spark in high energy automotive ignition systems. The compound is an excellent lubricant on rubber, plastic and ceramic surfaces and it also has good high-temperature properties, thus preventing fusing of spark plug boots to the spark plug. It will make installation of the boots easier. | Permatex Tune-Up Dielectric Grease | Size 33 oz