My '02 Beetle 2.0 has been burning oil since I got it which has never really been a problem. It will "choke" a little to let me know its low if I don't catch it! In October, I got an oil change before taking a trip across country and had no issues at all except when I got home she was quite low, filled her up with 5/40W. The other day my husband was driving behind me and said he saw "grey" smoke coming from my tailpipe. I stopped driving it immediately cuz I don't want to blow her up. I checked the forum and it seems like smoke could be nothing or could be rings or worse. Any suggestions for diagnosing her?