Few questions, please help

A little confused. Leaking oil at the exhaust; does that mean out the tailpipe or somewhere else. Are you burning oil with smoke out the exhaust? The plugs must be really fouled.

Dumb question but DRL is? Daytime running lights. They probably come on no matter what. Read the owner manual but the lights often come on without the switch being touched.

Agree about the manual on cd but look it up.

Now the oil coming out of the exhaust pipe. There is no way you can have oil coming out of the exhaust pipe. First of all there is not that much oil in the system to flow down the pipe, fill the muffler, resonator and converter, etc. Secondly, the oil would be burning and smoking so bad that the engine would not run. My suspicion is that when the engine gets good and warm, say after a nice drive, it no longer does this. I am suspecting that your exhaust system shows black inside (which indicates that it is burning a little rich) and that the condensation of the engine and exhaust system produce water which is forced to leave the system out of the tailpipe. As is leaves it washes off some of the soot in the system to take on the color.

Yes it is possible to loose oil through the pistons, that oil however will never end up dripping out of the exhaust system. Instead, it will get burned with the injected fuel and since it does not burn as efficiently as the oxidated gas it will smoke, probably blue in color, out of the tailpipe. As I said earlier for the oil to drip out of the exhaust you would have to be loosing a large amount of oil and burning with a smoke screen behind you that James Bond would be using. Another way that oil is used internally is that the head where the valves are could have seals that are failing and causing the oil to drip from the top of the cylinder in to the piston area.

That dark black that you observed is continuos inside the entire exhaust system and the water that is working its way from the engine will wash off some of the black and when it drop on the ground it evaporates the water and leaves the black residue of which can seem oily especially if the car is burning a little oil. Oil burning out of the pistons can leave the exhaust system black and slightly oily feeling. If you are getting to this point, have the compression checked on the engine. Make sure all cylinders have the same or very close to the same compression.

Thicker oil and some additives are temporary fixes but could give you some more mileage. You really never said how many miles you would have travelled on say a litre of oil. If it is only a few miles and you are adding a litre of oil, then you have serious oil consumption and would be that pulling the plugs would show them oily and wet. I would make the assumption that the car is getting harder to start or else it will as the oil will foul up the plugs.