Car Problem Reports

Toyota Sienna Sludge Buildup on Engine Due to Infrequent Oil Changes

Toyota Sienna Problem
13 Reports
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Model Years Affected: 1998, 1999, 2000, 2001, 2002, 2003, 2006

Engines Affected: 3.0L V6, 3.3L V6

Average Mileage: 116,750 mi (50,000 mi - 172,000 mi)


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.

  • Visitor, , 3.0L V6, 135,000 mi

    when I would accelerate hard getting on to the highway I would hear valve knocking. Also when I changed my oil it would be a little clumpy coming out. I did a little research and found that you can put seafoam in the crankcase. Read the bottle but I put like 4 ounces in the crank case and then changed my oil again in about 300 miles and I have no more sludge and no more knocking. I am getting slightly better mileage too. when I changed the oil after the seafoam the oil flowed well but it was really dirty for only having 300 miles on the oil change.

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  • Visitor, , 3.0L V6, 110,000 mi

    motor suddenly seized up. had to replace entire motor at our own expense

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  • Visitor, , 3.3L V6, 50,000 mi

    toyota dealer want me to do every 5000 miles ,is that ok or no

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