Using oil

Dear Dr,
You are probably burning the oil if you don't have any leaks. You may not be able to tell because it may be in small amounts, after all the engine has 150,000 miles. If you want to be sure you we need to do a compression test. If the readings are not with in specs you will need to do a wet test. After taking an initial reading pour 2 to 3 table spoons of motor oil in the cylinder and then repeat the test. If compession goes up the rings/cylinder walls are worn and this is where your oil is going.
Backyardmechanic :)