The answer is no.
But think about it, if any oil truly caused a sludge problem, some lawyer would be all over it. You would see TV commercials inviting you to send in your Penzoil receipt to join the class action lawsuit.
But think about it, if any oil truly caused a sludge problem, some lawyer would be all over it. You would see TV commercials inviting you to send in your Penzoil receipt to join the class action lawsuit.