take it to the dealership...
Neither. I would recommend you change it every 8,000 miles.
My 2005 Sienna XLE Limited takes 5 quarts with filter change.
6.4 quarts with filter change, 6.0 quarts without filter change.
Every 5000 miles, is when I do it on mine.
Change the oil filter every time you change the oil.
Bone dry with filter change, 6.4 US qts.
how often you change oil to a E350 2012..
It's a good possibility that the old oil was never drained, then the new oil added. Now there is way too much oil in the engine causing the sputter.
To change the transmission oil you must take off the transmission pan. Make sure to change the filter while you have the pan off. It is inexpensive and will give your transmission a prolonged life.
Change the oil filter every time you change the oil.
The type of oil used in a 2011 and 2012 Toyota Sienna is the synthetic 0W-20.