Hello everyone, I'm new to the whole New Beetle family I recently bought a used 2000 2.0LT GLS beetle and I noticed it was burning oil so I did an oil change to it and it worked amazingly after and no smoke at all, it was used about 6 times and then it sat for about a week and half not being used, however today I went to check the oil level and I realized it read extremely low on the dipstick, I checked it multiple times and still got the same result and I thought about putting more oil into it but I had no time because I was in a rush. So I did what I needed to do then I checked it again and it had been running for probably 30 minutes or so and when I checked it, it was back to a normal level. So please I need answers or anything! Also the oil I out into it was 0w40. ? Thanks.