I have a 2017 Mazda CX-5, 2.5L It has 160,000 miles on it now. Where does the oil go between oil changes. I did an oil change yesterday an it was 2 qts. low before the change. This has been happening for a couple of years now. Does not smoke, no oil light, engine has never been overheated, runs great, no problems. Overactive PCV system? Could it be the oil or is it just a hot running engine. I change the oil regularly every 5000 miles. Using Super Tech 0-20 full syn. I know it’s not burning oil, did a spark plug change a few months ago. I don’t know if this is normal or not. Thanks