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I think BMW is like Honda with regards to turbos. With the exception of diesels, I think they want to stay away from forced induction. Reason is simple: Turbos generally don't last the life of the car. I think both companies want their engines to hold up for a very long time, and this is not possible with turbos. I have had several turbo cars in the past, and you are lucky to get 150,000 miles on the turbos before a rebuild is neccesary. Most engines these days can easily go over 200,000 miles. Diesel turbos are alittle different because diesel motors are much more thermo-dynamically efficient, meaning they harness more power from the combustion process, thus reducing exhaust temperatures. Turbos generally hold up better on diesel applications because there is far less heat generated around the turbine assemble where the bearings sit. Also, there is no other way to make diesels efficient other than turbos, so I don't think either company had much choice in the matter.
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