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I leased a 2000 Sienna, and had no problems the first 18000 miles. At about 19000 miles, after three oil changes during this time, I began to blow smoke out of the tail pipe. Took it into Toyota dealership, and was told I have "sludge", as a result of a lack of maintanance. I explained my three oil changes, with receipts for two (I changed it once), and was told "the receipts mean nothing to me". Called 800 number in California, they supported their dealer. Was told I will have to pay at least $2500 to have my engine rebuilt. Is this a problem with the design of the engine, or the mileage suggested by Toyota (every 7500 miles based on my driving)between oil changes. I do not like being called a liar by Toyota, and expect them to back their warranty. Am planning on contacting television reporter who does investigations into this type of stuff (to keep it clean). If interested in having your name on the list of people for him to contact, please contact me at my email address.