Came across Ravenol motor oil on the German car enthusiast site Blauparts.com. Supposedly these real synthetic oils are all made in Germany and have multiple German car approvals. Does anyone know how good their oils are? Am wondering whether to use Ravenol in my Tiguan once the warranty is up and I no longer have to use Castrol. My thought is a German-made oil might be better for a German car as opposed to Redline or Amsoil, but without any further information I can't be sure. All thoughts and experiences with be welcome.