Did my first mechanical task, and changed here oil.

Sadly, I'm very disheartened as it now idles horribly and shudders.

I would hugely appreciate any advice on this.

https://xoutpost.com/bmw-sav-forums/...-beginner.html

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02' X5 E53 3.0i Petrol (210k km/130k miles)
Will trade coding skills (Javascript, React, Node, Django, Mobile dev) for car knowledge
ODB II: ELM 327 (Torque Pro app)