Q: Stuck and confused need help 2002 BMW X5 4.4l

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A week ago after a short drive p0011 code appeared the engine had a ticking noise on one side after doing research 50 percent says could be dirty oil the other 50 says it's the vanos my oil is pretty dirty looks black don't know should I get it changed or go to a mechanic to further diagnose this issue

My car has 108000 miles.
My car has an automatic transmission.

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