That's a very different and outlier experience from what I have seen in the e39 M5 community. My car was quite reliable, in reality the engine is under-stressed at 400hp for a 5L motor. I really only had two kind of failures over 12 years and about 80k miles. One was the instrument cluster lost a couple pixels, it was replaced under warranty. The other was a MAF sensor that went bad, but I bought a VW equivalent and solved the problem. Other than regular wear items like tires, wiper blade kind of things it was an extremely reliable car.... surprisingly unlike my wife's Honda Accord with overheating problems, CV join issues etc...
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