We are having words. They claim that the filter they installed is correct even though it does not have the slits or 4 holes. Furthermore the mechanic says " Who is to say that the oil pump didn't go out or that you didn't over rev the motor". I am livid. I wish that I could locate a TSB or something. I requested his part number and can't locate it online. He says it comes from a parts house that you have to be a dealer to order from. I can't seem to locate the parts house either.