does the warranty say computer or computers or ECU?

FRMs seem to be the only electronic I've heard fail. there's even a repair website. https://www.the-ecu-pro.com/bmw-frm-...RoCwMkQAvD_BwE

I think you're concern might be the valve seal issues that are common on the v8s. Then with the 3.5 turbo motors, there's, well, the turbos haha

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e70 - purchased 6/2018
e36 - wouldn't pass smog at 190k 2016
e53 - transmission blew at 225k 2012
e30 - sold as it was a little slow for a DD and burning oil at 220k 2011