[motex]

Long story short.........
Here in Costa Rica the "best" fuel you can get at the pump is 92 octanes, but recently they found that the 92 octane gas also called "super" is coming with high levels of MMT (Manganesium) which seems to be very bad for the catalyzers, since ALL gasoline imported here is run by a government agency, people are saying that is better to get "plus gasoline" which has an octane reading of 87 and use Octane Boosters on it, at least this way the car will not get those harmfull manganesium levels........

any feedback and experience with bad gasoline's will be appreciated, my car is an X6M