im not sure what exactly but there will be organoelemental components incorporated into the oil that will have some affinity for the metal. was actually at a job interview at BP a few months ago and was hoping to go to the castrol division. tried to get them to tell me what was in magnatec but it was trying to draw blood from a stone. i did however, manage to embarrass them into admitting that BP ultimate is a con, only useful for already powerful engines. and the cleaning properties of the petrol only take effect after about 30 tanks worth, which equates to about a years wages!
says alot when one of the senoir managers at the plant i was at buys Tesco petrol
First oil change I done on the car I used magnatec and it certainly quietened down some noisy components of the engine.