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I have had too many problems with my Sienna mini-van: sliding doors problems, back door latch failing on a yearly basis, and engine issues. Bought (first hand) a 2001 Toyota Sienna XLE (v6). First couple of years were fine. Noticed around 2007-2008 that every trip that involves the highway will result in the oil to vanish as the Oil light will turn on. I ignored the issue at first as a mechanic indicated there was no leak. I simply put more oil and things were fine up to the next trip. I then noticed that a gray vapor was coming out from the exhaust each time the car was started (morning). In 2009, I took the car to the dealer (Stevens Creek Toyota). It cost me 3K to fix the issue (they indicated the engine needs to be removed and cleaned). I really didn't get the real problem but just wanted to fix the problem. Unfortunately, the same problem started happening few months later (2 or 3 at most). In 2010, we went for a summer vacation (500miles round-trip) and again lost all the oil...