Grease is crucial to heavy construction equipment. "Many times, grease is not only the lubricant, but it is the barrier to contamination," says Stede Granger, OEM technical manager, Shell Lubricants.

Dielectric grease is a silicone-based, non-hardening grease used in electrical connectors to lubricate the pins and keep moisture, dust and contaminants from getting inside the connector. 2.