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Engine Sludge problem - I am facing $3,300 in repairs on my 2000 Toyota Sienna XLE van with only 17,000 miles and oil changes performed at 7,000, 10,000, and 16,000 miles. Told that it has engine sludge build up that can only be due to improper maintenance and owner neglect, that it could not have happened if oil changes occured when I indicated, and suggested that I contact the independent companies that changed my oil (implying that they really did not do an oil change). Charges are not covered under warranty. Even after repairs are complete, they may elect to not continue warranty on the engine of the vehicle. I bought a Toyota because of their record of reliability and customer service, and have found this to be a complete fallacy.