logically you would think the xfer case would last longer with the mod.but i recommend shutting down the 4matic operation during that part of the year when you would not use it.this can be accompished by generating a fault code in the 4matic computer effectively shutting it down.this is most easily acheived by flipping the test/run valve under the hood to the test position with the engine running and then flipping it back again.to restore 4matic operation just remove battery power for a short interval.this will reset the computer