Prolong Engine Treatment is formulated with Prolong's AFMT™ advanced technology to treat the metal surfaces of both gasoline and diesel fueled engines. As motor oil is pumped through the engine, Prolong Engine Treatment molecules interact with all of the metal surfaces, chemically bonding to create a protective layer that reduces damaging friction and heat. Temperature reduction is especially important in today's smaller import and compact engines that tend to run hotter. Prolong Engine Treatment is particularly effective under extreme pressure conditions, in the very areas of your engine where severe metal-to-metal contact squeezes motor oil out and away. Prolong Engine Treatment adheres to metal surfaces in the engine, which means Prolong is working to protect your engine even when the motor oil is not yet fully circulating. Unlike other engine treatments on the market, Prolong Engine Treatment does not contain any solid particles such as PTFE resins, 'molys', zinc, copper or graphite. There is simply no other product that works as well as Prolong to reduce friction and heat in your vehicle's engine. Prolong is the only engine treatment company to offer a FREE Lifetime Limited Product Engine Warranty and also has the most generous eligibility requirements of any engine treatment warranty available. A vehicle less than 10 years with less than 100,000 miles on the odometer may be registered. Just purchase the 12-ounce size of Prolong Engine Treatment and add it your vehicle's crankcase (the same opening where you pour in motor oil), complete the warranty registration form that comes inside the package and mail it in.