Problems for specific Toyota Sienna years:
Car problem reports
Problem with your car? See what our experts say or submit your own.
Most reported 1999 Toyota Sienna problems
Sludge can build up in the engine because Toyota did not recommend frequent enough oil changes. Lexus will sometimes offer a discount on cleaning the engine if necessary. Owners who changed their oil every 3,000 miles did not experience these problems. This sludge build up can lead to excessive oil consumption.