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a truly loaded question
if the fluid was changed often, it will last 300k
if the fluid was never changed, it may blow up at 100k
if they towed anything over limit, it may blow up at 100k

best thing to do is ask the owner how many times they changed the transmission fluid. Also, transmission fluids should NEVER be "flushed" with a machine
 

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thank you. I want buy 2011 Sienna Le 117 000mi. Its good idea? this year Sienna is good?
yes that is a good year. one MAIN thing you NEED to check. look underneath the car, in front of the oil filter housing. You will see 2 oil lines. If you see black rubber lines, it has the old lines that bust, and you need the new part. This part can bust, leak all the engine oil, and ruin the engine in about 5 seconds. The new part is METAL. you want to see this when you look underneath :


apparently another known issue is slow head gasket leak. just check to make sure the coolant is full, and check underneath and look at the motor for pink fluid on the exterior.
 
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