The engine Burn out
Worn engine parts. Rings, bearings, etc.
No, they do not.
A couple things can most commonly wore piston rings which cause the engine to burn off oil that is allowed to leak into a cylinder where combustion occurs. Could also be a faulty engine seal allowing oil to leak when parked or during operation. I would check for leaks first.
A diesel-type engine can be made to run on waste oil, BUT used motor oil also contains many toxins such as heavy metals that come from the engine as it wears. Burning the used oil releases these pollutants into the air. So, unless you could find a way to remove the contaminants from the oil, it would be unhealthy and possibly illegal to burn it in an engine.
The correct oil weight is now 5W20; it used to be 5W30, but Ford has recently allowed your engine to use 5W20 as an energy saving oil. If you don't use synthetic oil, stick with the 5W30; non-synthetic 5W20 will burn out your engine faster than non-synthetic 5W30.
You probably spilled some oil on or near the engine, making it burn when the engine heats up.
if your engine is knocking that means you need oil. go get an oil change or add a quart asap or the engine will burn out
Several things can cause an engine to burn oil, and all of them are pretty normal in an engine with lots of miles. Oil control rings are often a problem. They are on the piston and while they can be replaced, you'd be better off buying a new engine. Other things that can cause an engine to burn oil are valve seals (common) and valve guides (uncommon). If you have a high mileage engine, I wouldn't worry unless you have a big cloud of black smoke coming out the exhaust. Best thing you can do is just check the oil often.
Yes and it is normal.
Too much oil will damage your engine as not enoght oil too will damage your engine. for example; To much oil will burn your oil rims inside the engine causing your motor to start smoking thru the exhaust system. Exc. Not enough oil will burn your bearings inside the engine causing your motor to start knocking and make noises. exc.
No, but burning oil will give you bad spark plugs.