A car uses too much oil when what parts are worn?

If your car is using to much oil, you'll need to find out if your oil is leaking or not. If the oil is leaking out and this is the cause of the lowering of the oil level, you may have a worn gasket or plug in your sump, sump gasket, engine head gasket ect. If your oil is not leaking, but being burnt by your engine, the most common cause is the rings on your pistons are worn. This will cause oil to get past the sealling surfaces of your piston rings and enter the combustion chamber where it is burnt along with the fuel. The tell tale sign for this is excess exhaust smoke. The smoke will also be a blue colour.