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KEEP IT!
Beautiful car! I'm going to say keep it! I know some modded F10 M5 owners with over 100K miles and still going strong with no issues. Don't trade it in because you will loose a ton of money. Like you said it has been reliable probably because you have taken good care of it. On your next oil change I'd take a sample of it and have it sent out to a lab like Blackstone to get an oil analysis done. If everything comes back good that will relieve your concerns about your engine. If not then maybe look at your other options.
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