>JCL
Can you explain why low oil pressure is indicative of bad bearings??? Wouldn't he have some rod knock if the bearings were bad?

I do like the idea of connecting an oil pressure gauge. And I do think it's possible to have an oil pump going south, even if pressure is only low at idle. But I do think the long sit this car had may be a clue to the symptoms, especially since the previous owner said the oil removed was "really nasty". Sounds to me like something gummed up and a motor that did not get proper oil changes. Perhaps a motor flush would help.

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2014 BMW 328i Xdrive
2011 BMW 335i M-Sport
2008 BMW X5 4.8i Sport
2000 BMW 528i 5sp