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Blacktemplar that is not good at all... low mileage with a diff leak doesn't make any sense. If you have warranty, ask the dealership to fix it (get both left and right seals replaced all at once).
My x3 is Out of warranty, so I paid out of pocket, and a BMW M specialist in Ontario replaced the rear diff seals within the hour (actually), he's highly experienced on BMW's and BMW M vehicles. RMP Motors... the owner worked at a BMW dealership for 10 years, then decided to open up his own private BMW specialist shop.
I originally knew about the diff leak, but I ignored it (as it was just oil sweat on the diff), but as I drove the x3, there was a whine noise coming from the rear end, and at the time I knew I had to get the diff seals fixed, or else it'll get louder and the diff will lock up...
so I found RMP motors and got it done there as they are BMW specialized, and the BMW dealership told me it's 'normal'.... for diff to have sweat spots of oil... (that just means they are being lazy and don't want to fix a diff leak). I did't argue or dispute with them because I bought my x3 at a third party non-bmw dealership, but it had BMW original warranty. I just didn't want to dispute with the BMW dealership... talk is cheap.
If you can, get the dealership to fix it, or find a good BMW specialized shop to do it for you at a lower cost, AND make sure you replace the diff fluid as well!!!
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