Hello, I searched around and didn't see this on here, so I apologize if it is a repeat: Everyone here mentions Mobil 1 (as well as on the oil fill cap), but has anyone had a problem using anything except Mobil 1? Advanced Auto has their oil change specials, but of course not on Mobil 1. I have always used Castrol EDGE on my Volkswagen with no trouble. So, has anyone had any problems using Valvoline SynPower or Castrol EDGE full synthetic? I don't want my oil consumption problem to get any worse. Thanks for any info!!