walang kwenta yan. Its not the same as its original blend. Naging selfish yung si jun simon siguro, ang inventor ng pertua. Used to make a difference, in fact, we did lab tests using petron's laboratory on engine oil life, and it did extend it, vs engines that did not have pertua. But later on, we noticed the expected effects were not the same. Good thing we kept a bottle of the original blend. Di na pareho.