Hey hey hey there not everyone at Kragen,checker,murrays ect... are dumb asses but got to admit tho that the people that are super good and are under paid leave for the same reason. Then they hire young kids that dont know jack and hope to god they learn fast. Its funny that people think additives will fix their leak or problem. Its just a temp fix. Actually fixing the problem is the only for sure fix and the best fix :-) The Z's deserve the best anyways;-)