Five litres according to owner's handbook. Recommended oil is 0w-x or 5w-x, preferably fully synthetic.
Engine Warning Light
Take it to Jiffy Lube.
5 / 40 fully synthetic oil
It is important to maintain the levels of fluid in a vehicle. The engine oil capacity of the 1999 BMW 323i is 6.9 or 7 quarts of oil.
Your 2007 BMW has an engine oil capacity of five quarts. The automaker recommends that you never overfill the engine oil.
The engine oil capacity is 6.5 L (6.9 US Quarts).