Yeah, I have heard that. I just don't know if it's for me. I would rather just run a bunch of cheap oil through the motor and see where I end up rather than go that route. I feel the same way about Seafoam in the oil too. In the gas tank or in the intake manifold seems better, and I have used BG44K with some success, but even that makes me nervous. It just seems like it might solve one issue, but could cause another one.Pretty common technique in the old days when oils had less cleaning agents, but not my favorite nowdaus