The manual says 5k mi or 6 mos, whichever comes first, with either 5W20 or 0W20. I saw on the Toyota website where the 2010 & 2011 models were able to go to 10K mi/12 mos with the 0W20. Any reason why the 09 engine would be any different? I'd rather just change my oil once a year unless there is...