ZAP Grease BLACK is a water resistant Calcium soap thickened grease with graphite. The grease withstands heavy loads and shock loads without failure of the lubricant film making it the right choice to lubricate severely loaded joints, hinges and mechanisms of trucks, trailers and other heavy-duty vehicles. It is particularly suitable as a fifth wheel lubricant. ZAP Grease BLACK provides reliable protection against wear. Graphite particles retain lubricity even after accidental oil loss or overheating.