Why Use an Engine Oil Booster after using an engine treatment? Engine oil and engine treatment additives get used up and become less and less effective over time. Even metal bonding agents wear off between sliding surfaces and under pressure. It is necessary to replenish the additives to fortify your oil. ProTecta has an advanced multi-functional synthetic formula that not only treats the metal but fortifies the motor oil as well. Use with Complete Confidence and Peace of Mind. ProTecta's advanced formula is compatible with petroleum, mineral, and synthetic motor oils and oil additives. Perfect for new or older cars. Will not void new vehicle warranties. (See details of ProTecta's 8 - Year/200,000 Mile Engine Warranty by clicking on the More Detail icon). Contains no chlorinated paraffins, PTFE resins, "moly" or graphite like other engine treatments. Will treat 5 oil changes for cars with 4-5 quart capacity! ProTecta Engine Oil Booster is specially formulated to be used after installing the ProTecta Engine Treatment. The Oil Booster replaces extreme pressure agents used during the last oil change as well as detergents, dispersants, corrosion inhibitors, anti-oxidants. It fortifies the motor oil for superior performance. Testing has demonstrated that additives are depleted during use in your engine. This is why companies have stopped claiming that a product will last 50,000 miles etc. At SFR we never believed that additives last forever, as with moving metal surfaces rubbing, additives will do their job and get used up. The ProTecta Engine Oil Booster should not be used alone without using the ProTecta Engine Treatment. The ProTecta Engine Treatment contains a lot more additives for the initial treatment and the Engine Oil Booster replenishes those additives depleted during subsequent oil changes.