Sooty exhaust and excessive oil consumption?

In the great plan of things simply claiming excessive oil consumption is not enough. You think you know what you mean but how much is excessive?

Car manufacturers insist before taking any warranty action for excessive oil consumption a test must be carried out to decide whether the consumption is excessive and whether repair will be economic. Even though your car isn't under warranty the principle generally will be the same.

An oil consumption test is carried out after a few basic checks and means topping up the oil exactly and then driving 750 miles of mixed town and country driving that doesn't include any sustained high speeds or heavy congested traffic. The oil is then checked and topped up exactly and if the quantity is less than 1 litre it is considered acceptable due to any improvement being uneconomic to achieve.

How many miles is your car covering per litre?

Of course if the engine is producing smoke things are somewhat different...

Add 1 quart.
Look for obvious oil leaks.
Check to see if it is burning oil.... sooty exhaust pipe.
Check PVC valve and where PVC pipe goes into manifold or air cleaner for excess oil.
Depending on age of engine and time between checks for oil level, this may not be excessive.

How many miles on your vehicle ? Do you see any leak spots on the ground from the truck ? Blue exhaust , oil burning , valve guide seals , piston rings , PCV clogged .

Oil Consumption Diagnosis
Checks
Causes
Excessive oil consumption, not due to leaks, is the use of 1 L (1 qt) or more of engine oil within 3 200 kilometers (2,000 miles).
Preliminary
The causes of excessive oil consumption may include the following conditions:
• External oil leaks
Refer to Oil Leak Diagnosis .
• Incorrect oil level or improper reading of the oil level indicator
With the vehicle on a level surface, run the engine for a few minutes, allow adequate drain down time, 2-3 minutes, and measure for the correct engine oil level.
• Improper oil viscosity
Refer to the vehicle owners manual and use the recommended SAE grade and viscosity for the prevailing temperatures.
• Continuous high speed driving and/or severe usage
• Crankcase ventilation system restrictions or malfunctioning components
Refer to Crankcase Ventilation System Inspection/Diagnosis .
• Worn valve guides and/or valve stems
• Worn or improperly installed valve stem oil seals
Refer to Spark Plug Inspection .
• Piston rings broken, worn, or not seated properly
Allow adequate time for the rings to seat.
Replace worn piston rings, as necessary.
Refer to Cylinder Leakage Test .
• Piston and rings improperly installed or not fitted to the cylinder bore
Refer to Lower Engine Noise, Regardless of Engine Speed

definitely an oil consumption problem. How many miles? Could be worn rings and or valve guides. The oil light on when hot indicates low level or possible or weak oil pump. Check compression for possible head gasket or cracked head. I wouldn't drive it untill diagnosed.

I’m happy to assist further over the phone at https://www.6ya.com/expert/howard_977676954994c5b2

oil consumption of say 1/2 litre in 5.000miles would be normal even 1 litre in 5.000miles would be ok but any thing else is staring to be excessive. Oil consumption is an indication of a problem with the oil control rings and valve stem seals . Add to that your statement of a knock coming from the exhaust I would be inclined to have a compression test done to determine the condition of the engine . I consider 65.000 miles to be a little young for bad oil consumption so with the noise I would suspect a broken ring and a scored bore

997 Porsche - Oil Filter Location.

This is the easiest way to respond to your query. Please refer......

http://forums.rennlist.com/rennforums/997-forum/286484-diy-oil-change-in-the-997-a.html

If you have been under the car at the rear it is surprising that you could not locate it. Purchase the correct tool (as shown in the photos) for the cannister removal before you attempt to replace the oil filter.

black smoke when driving.(not slowing down)is an indication that the rings are shot.(engine rebuild)exhaust will smell of oil.black smoke on deceleration indicates valves stems worn.(head rebuild)

You seem to have a bad head gasket. Check the exhaust,while running,to see if white smoke is
pouring out.Get it checked out ASAP,since you don't
want to severely damage the engine any further.
Good luck.

At 40K miles it shouldn't burn that much oil, unless the motor has been abused or overheated. With no signs of oil leaks, the engine must be burning it via the exhaust,

Change the oil (use a good quality oil) and then observe oil consumption.

If it still uses excessive oil check further as below:-
1) if it blows blue smoke on steady accelleration (pistons or ring wear),
or
2) only blows blue smoke on initial accelleration after a period of steady coasting or de-celleration (faulty valve stem oil seals).

the oil consumption could be worn piston rings or the egr is clogged and forcing oil into the air intake but that new of a car its unlikely unless someone sugared the gas tank the sooty exhaust could be from the oil consumption