Well, being an oil nut, and having both a good full flow canton/mecca filter, and an oilguard bypass filter, I still have a few powerful flat magnets on the oil pan. (I generally only have one there, but I'm working on the fuel mods, and then I'll zip tie the other 4 magnets around the fuel lines... ) LOL More urban myth's or voodoo magic?
My thought is being a new motor, it's possible there were some small machine chips left over in the motor. The magnets are pulled just prior to draining the oil, and I'd like to think the oil draining out will help to remove any iron that was held in place by them.
So on that note, the ONE magnet I have had on the motor is just above the oil drain plug. (Better to have the oil draining out flush out the metal is my theory.. LOL)
Oh, and the fuel magnets? I was at a county fair years ago. This guy was selling a clamp on gadget that he wanted 50.00 for. Had powerful magnets held in place, and the idea is as the fuel flows through the magnetic field, it reversed the polarity of the fuel, and made it burn better and cleaner..
Bogus? Well, I spent about 8.00 on powerful flat magnets at the dollar store... Then with big zip ties clamped them to the fuel line the same way, and guess what? Improved my fuel economy by 3%. Dont' know about cleaner fuel, but it does seem to work on the fuel economy side of things.