Oil change (let it drip for about 4 hours after a long drive). The temperature outside has been well over 100F today! Working in and under the engine was not fun. Replaced the cabin and engine air filters as well.
I used all Original BMW parts, including oil, and ended up costing me about $94. I imagine dealership costs would run around $300 for parts and labor. Feel so much better now.

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'03 Black BMW E53 3.0i 110,000+ miles
'03 Black Mercedes-Benz W211 125,000+ miles
'13 White Mercedes-Benz W2o4 New