Hi guys just saw on Amazon Shell Rotella T6 is $19.57 for a gallon jug...$16.53 if you subscribe to get it delivered every 3 or 6 months. I usually just buy Supertech Syntethic or Pennzoil Platinum from Walmart both which seem to get high praise here on this forum. http://www.amazon.com/Rotella-550019921-...#productDetails I know it says for Diesel engine but as far as I can tell it can be used in gasoline engines as well, it's rated API SM which is what my car calls for *2010 Subaru Forester NA* What is everyone's opinion on this oil and more importantly would you put it in your vehicle versus the Supertech or Pennzoil? THanks