Excess Engine Oil Consumption on Toyota Sienna

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.

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Average mileage: 116,750 (50,000–172,000)
Engines affected: 3.0L V6, 3.3L V6
7 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2006
13 people reported this problem
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problem details
2002 Toyota Sienna - 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.
1999 Toyota Sienna - 3.0L V6 110,000 mi,
motor suddenly seized up. had to replace entire motor at our own expense
2006 Toyota Sienna - 3.3L V6 50,000 mi,
toyota dealer want me to do every 5000 miles ,is that ok or no