Usually a leak is caused by a gasket or seal no longer sealing properly, allowing oil to get by.
They can fail due to age (materials break down, harden or shrink), heat, or the pieces they are supposed to seal no longer fitting properly.
in some cases yes you will have an oil leak
It depends on where the leak is and what is causing the leak.
An oil leak is always going to be out of the engine as the engine contains oil and the car does not. I think you are saying you are loosing oil with no apparent leak. If that is the case the engine is burning oil and that is why you see no leaks.
Because you have an oil leak.
It will continue to leak oil and if you do not add oil regularly it will eventually cause engine damage.
No.
Oil
Having an oil leak in the same spot under your car is one sign of an oil pan gasket leak. Another is smoke from the engine department.
the way you can see if your car has a oil leak look on the ground to see if there is a spot before you put
Yes.
Yes
when you drive with an oil leak the oil drips onto the road and makes the road surface slippery for motor cycles and other vehicles.