I just saw your other post regarding the spark plug wires. First, you should get the On Board Diagnostic (OBD) system scanned for Trouble Codes (DTC) to determine which cylinders are missfiring. The Code will start with P03xx if their is a misfire. The last two digits (represented as xx) will be which cylinder is misfiring.
What you want to to is swap the coil pack from the cylinder that is misfiring with one that is not. If this misfire follows the coil pack, then you know the coil pack has gone bad and needs replacement. With spark plugs, BMW engines are pretty picky about what plugs they use. I personally prefer NKG plus, and use the BRK6EK plugs in my M52.
The oil leaking into the plug wells is from the Valve Cover Gasket (VCG). Its a rubber gasket, and over time turns hard and brittle from the heat of the engine. This is quite common. I have replacement my VCG because of this before.
Replacing the VCG and plugs/wires/coilpacks at the same time will save on labour costs as the old ones will all need to be removed to replace the VCG.
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