The E53 is based on the E38 , using versions of the same electronics adapted for 4 wheel drive .
Subframes are an upgraded version of the E38 . The E39 is not up to the job .
The E39 V8`s share some E38 parts .

The first car BMW built was an Austin 7 under licence .
BMW have used British ideas ever since .
BMW V8 engines are based on the Rover V8 engine which itself is based on a Buick all alloy engine .

A British engineer spotted the Buick alloy V8 at a place he was visiting and liked it so much he bought the design rights for it .
American drivers originally thought the alloy engine would not be strong or durable and so it was abandoned by Buick .

I suspect the BMW inline 6 is based on the Austin Healy engine .

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