Different oil brand impacts BMW vanos funcionality?

[Koster_13]

No, brands mean nothing, specs do, and as long as the oil you put into it meets the specs for your engine, it´s good.

Drain intervals however have a HUUUGE impact on all hydraulic cam adjusters and solenoids.
The amount of problems i´ve seen while working as a mechanic on those parts due to manufacturer recommended drain intervals and the viscosity shear and varnish formation that follows from it are insane.
Engine oils in modern engines are not just a lubricant anymore, they´re also a hydraulic fluid, and the moment they shear to below the required viscosity, they can´t actuate the adjusters properly and you get running issues and codes for improper values on the cams and/or timing.

Change your oil at 5000 miles, that´s the magic that keeps engines running trouble free for a long time.

 

[JackWildfeuer]

No, You have a mechanical issue. It could be almost anything. It could be bearing clearance, timing chain stretch, vanos parts etc.....

Think about it you have crank pos sensor and cam pos sensors that are cross checking each other. You can actualy detect timing chain wear and main bearing wear via these sensors.

Assuming you checked bearing clearances during the rebuild and those where good I would be looking at any parts you reused. I am not current though on BMW's.