I use regular real (non-synthetic) Penzoil motor oil in my VX and change it at JiffyLube every 2,500 miles. My VX runs like a champ, and doesn't consume or leak a drop of oil (perhaps I'm just lucky).
Fellow member "HYPERKID" had switched over from regular real motor oil to a synthetic and it fried his engine. I'm not gonna' test fate by switching over to synthetic; besides synthetic motor oil is just way too expensive. I prefer to use regular real motor oil, and just change it (with a new oil filter) a bit more frequently at 2,500 mile intervals.
I was use Castrol Edge 5W30 but I want to chenge it because I think it burns too much. I was thinking at Mobil. Thank you very much guys. It`s pretty hard to take care of an US specs car in Romania since everybody knows a lot about european cars.