So I had a noisy lifter that would come and go. It ticked about 90 percent of the time and I figured a lifter or even a cam and lifter job was in order. What the hell I said, let me try some of this snake oil stuff, right? Even the name, "Marvel Mystery Oil" can be a synonym for Snake Oil but behold, I dumped a quart into my motor and like magic, the tick went away after 15 minutes. I let the motor cool down, then restarted and no tick. I let the motor Idle for close to an hour with periodic romps on the pedal and still no tick. This stuff has been around forever and I can't believe I didn't try it sooner. I am now a believer.