As the title suggests. My 2003 forester is consuming oil but in a very weird way. I have noticed oil consumption over the last 6 months and have changed the pcv valve as I was recommended it. But there wasn’t a difference. I changed my oil and over the span of a month drove 540 miles. Ive frequently checked my oil cold and it stayed around full. I checked yesterday and it was just about full, this morning when I check cold it’s at low.

The car has 67k miles. It’s an N/A 2.5 5speed. There’s no smoke. The only sign of oil anywhere is the oil pan right by the drain bolt had a slight film of oil on it but it never drips, and there’s never any that looks like it’s misted or sprayed.

I deduced this to old car oil consumption, Subaru 1qt every 1000 miles. But how does it go from full to low in the span of 20 ish miles? After adding a qt cold, im at full. After driving I’m over the hot oil level mark.

Am I consuming oil? I check in the same conditions in the same spot, did I really lose oil or is the reading just throwing me for a loop? If it’s just the reading, how can I be sure before driving my car on what looks like low oil? If anyone has any suggestions let me know, i feel like I’m going crazy.

Thanks