I received a packet in the mail from Toyota over the weekend that included a new warranty/maintenance guide and a letter. The letter basically states my 2010 Tundra is 'certified' for synthetic 0W-20 oil. It talks about the advantages of the oil and emphasizes that 10,000/1 year oil change intervals are now recommended. Anyone else receive this letter? I wonder if I can continue my 5,000 mile oil changes that I get for free with my 2 year/25,000 free maintenance package?