Your first problem will be finding that V6...BMW never made one. Second, to do a swap like this you are looking at about $15K. I only assume you need better fuel economy. In that case, a small underpowered 6cyl will consume almost the same as the V8 to move that HEAVY car. If you want to save on fuel, get a propane conversion, will save 50% off gas price. I know a few 7 series owners who run the same, they are happy.
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