If they claim zero miles you better ask them. Their is NO "new" transmissions. None. You cant even buy them from BMW. They could mean it has had a rebuild and has yet to be installed, but get proof its had a rebuild.
Average transmission swaps run about $1000-2000 depending on shop. The labour is the killer. Takes about 8-10 hours.
It's not lifetime. All fluids break down over time.
The automatic transmission in a 328i is the GM 4L30E. This is the same transmission found in the Isuzu Rodeo. GM has never said that their transmissions have a lifetime fluid. BMW did this because they make more money replacing your transmission then they do changing your fluid. Many many mechanics have bought into this a well and will state that BMW transmissions are lifetime fills as well. Any real BMW specialised will tell you the truth. Recommended service interval is every 50,000 miles. Without abuse and proper fluid changes you can exponentially prolong te life of your transmission. The same with the rest of your car. I run Mobil 1 0w-40 as recommended by BMW in the LL-01 bulletin.
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