Wholesale closeout SLick 50 Classic Engine Treatment; Slick 50 Classic Engine Treatment is engineered to outperform and optimize engine performance. Its advanced Cerflon technology protects your engine, while resisting chemical breakdown. CERFLON is a ceramic-reinforced PTFE (Better than PTFE alone.) Protects against power robbing friction & heat Enhances oil durability Cleans & prevents sludge Use every oil change for maximum effectiveness