2006 BMW 530i with a slow/small oil leak.

Check exhaust smoke color when engine hot. If there is white smoke, there may be oil in the pipes. Means the valve seal is leaking oil into the cylinder. Another way to check is to look at the spark plug tips. If is full of soot like burnt oil then the oil is leaking into the cylinders.

If yours is E60 turbo, check the presence of residue oil in both the exhaust and intake turbine. If there is, the oil seals in the turbo housing is leaking oil. They do sell service kits for turbos.

Try changing the oil (probably due) and then cleaning the area of the filter and the plug and also clean the plug off as well sometimes people carelessly change oil and don't clean it and,leave something on the surface and the filter or plug does not seal and then leaks. Place a flattened box underneath after and see if and where it is leaking. If all else fails try bars stop leak

more than likely the smell is oil not wires check the valve covers and the front of the
engine or do you notice any oil spots in the driveway if not than its burning internally
all i can say is keep an eye on it

i hope this helps you
bob

STP won't stop the leak, only disassembling and replacing the seal. However, the car could be burning oil but the catalytic converter will complete the combustion of the 'smoke' to water (H2O) and Carbon Dioxide (CO2).

At 230,000 KM, I wouldn't be surprised that the rings are worn or the valve seals are leaking internally.

take it to an accredited service center , put it on a hoist for a proper inspection

as a mechanic I will say it can be multi things that can cause a leak. but when you say it goes away on slight incline that normaly means it is toward the front of the engine. I must say just because their is low miles does not mean a seal will not go out. I have replaced seals on cars with only 10,000. It is normaly caused from vibration or misplacment of seal. If you look under the car look for a wet spot on the engine or its components then email me back and I may be able to help you narrow it down. I would not freak out to bad though monte carlos are easy to work on and should not cost much to fix it.

head gasket leaking. does the oil cap look like pudding stuck inside of it? if so that was caused by the tow fluids mixing together in the engine

Any type of fluid leak is not normal. Especially engine oil.

the leak is most likely coming from either the differential cover gasket or the input flange that the drive shaft attaches to, this is called the pinion seal.

Probably the pollen filters as well, brake fluid and anti freeze. If this is your last free service with the dealer it pays to ask them if you can check the service schedule list for your car.