Threadlockers blue medium strength loctite oem specified 242 carded 2.5 ml Use for valve cover bolts, water pump bolts, oil pan bolts, drive shaft bolts, rocker arm adjustment nuts and carburetor studs. For all 1/4 inches to 3/4 inches diameter nut and bolt assemblies. Locks and seals while preventing parts loosening due to vibration. Resis ts virtually all leakage, shock and vibration. Protects threads from corrosion. Removable with hand tools for easy disassembly. Resists light oils and chemicals and dripping from threads during assembly. 65 to 300 degrees Fahrenheit temperature resistanc e range.