For parts, I always use FCP Euro to show me which parts is the OE part (usually means the same exact part that is on the car, without the BMW branding). If no OE are available, I might take a chance with a OEM part (part made by part manufacturer but not the original part on the car), for example the OFHG, I would go with Genuine VS Elring since the Genuine is now Japan made for a few years and apparently better, and well the Elring is not the OE part either. But for valve cover I would get the Elring gasket since FCP says it's the OE part.
Yes BMW say to replace tubes but I re-used them to when I did mine. I can only assume they say to do that to avoid any damage to the coil as sometimes you might bend them hard when removing.
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