I bought a 2011 Toyota Sienna when they came out in March of 2010. It calls for 0W-20 oil. I now have 15,000 miles and the vehicle uses no oil between changes. I have a feeling that 0W-20 oil will become the standard just as 10W-30 was the norm which then gave way to 5W-30.
I’m certain that Tom McCahill who was the automotive writer for Mechanix Illustrated musgt be rolling over in his grave right now. McCahill didn’t like multiviscosity oils–he said that 10W-30 oil was a lousy number 10 and a lousy number 30. He used a straight weight oil one weight higher than specified, took extra time for warm-up and claimed that he never had an engine that burned oil. I’ve had the same experience–I use a straight 30 weight oil and don’t have any oil consumption, but this is on my lawnmower that I have used since 1988. I follow Toyota’s recommedations on my Sienna.