any – white lithium grease good on rubber. Silicone grease is safe on rubber and actually helps to keep it soft. Any other grease with a mineral oil base will degrade natural rubber.Click to see full answer. Keeping this in consideration, what lubricant is safe for rubber? silicone is white lithium grease safe on rubber and plastic? Lithium is used as the base for the grease. It comes with a variety of additives for various applications. But yes the vast majority of lithium greases will work fine with plastics so I’ll add it to the list. Thereof, what do you use white lithium grease for? WD-40 thick High-Performance White Lithium Grease lubricant provides great protection for heavy duty, metal-to-metal applications. It can be used outdoors regardless of weather and temperature conditions. This makes it ideal for use on automotive connections, tow bars, gear and brake mechanisms and CV joints.Can I use white lithium grease on spark plugs?White Lithium Grease. – Dielectric grease is kind of a tune-up grease commonly smeared inside spark plug boots so the boots can be pulled off after long hours of running.