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The 2004 Toyota Sienna has double overhead cam (DOHC).
Any auto parts store will sell "ATF" the bottle looks the same as a quart of oil.
There are two types of transmission on a 2004 Toyota Tacoma: 5 Speed Manual, or an automatic transmission. Depending on your preference, you can purchase/request the transmission that suits your needs.
The type of oil used in a 2011 and 2012 Toyota Sienna is the synthetic 0W-20.
The 2013 Toyota Sienna has double overhead cam (DOHC).
The 2003 Toyota Sienna has double overhead cam (DOHC).
The 2007 Toyota Sienna has double overhead cam (DOHC).
The 2010 Toyota Sienna has double overhead cam (DOHC).
The 2008 Toyota Sienna has double overhead cam (DOHC).
The 2006 Toyota Sienna has double overhead cam (DOHC).
The 2005 Toyota Sienna has double overhead cam (DOHC).
The 2011 Toyota Sienna has double overhead cam (DOHC).