Engine gaskets and seals for the 2004.5–2007 5.9L Cummins are vital for keeping fluids contained and maintaining compression within the engine. They include components like head gaskets, valve cover gaskets, oil pan gaskets, rear main seals, and timing cover seals.

These parts prevent leaks between mating surfaces and ensure the engine runs efficiently and cleanly. Over time, gaskets and seals can wear, shrink, or crack—especially under high heat and pressure—leading to oil, coolant, or air leaks.

Quality replacements are crucial during repairs or rebuilds to keep the engine sealed, protected, and performing at its best.