So how long would you folks suggest running some Marvel Mystery Oil in a 350SBC with 10w30? I've heard everything from substituting one quart of my conventional oil with a quart of MMO...leaving it in the life of the oil change (approx. 3,000miles)? I've heard adding half a quart for the same duration? I've heard only running said amount for no more than 300 miles? Adding just a pint? Adding only 2 ounces!!? I have an email to MMO with the same question...but I wanted to get your opinions. Any help is greatly appreciated! By the way, the issue...I have a very light lifter tap that I want to try and quiet...I know...if you heard it, you would look at me and laugh...it's not loud at all. I do plan on replacing the lifters next Spring...but I'd like to see what MMO can do in the meantime. I've heard all kinds of great things about this stuff...never anything bad... Thanks!!