Hi again i have just change my oil and put seafoam about 6oz and the rst of the seafoam in my gas tank, Now the lifer is still my that sound! I under stand that cause it was there already. How along when the sound go away do i have to this 2-3 times until it is fulley flush out? I also upgraded the grade of my oil i usely put 10/30 not i put 15/50 is a good choice or not.