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White smoke and sludge @26,000 miles.I use Mobil 1 synthetic oil and filters,and change AT LEAST every 6000 miles.This is a 2000 Sienna. I could understand the sludge if it were my dad's corolla and had 275,000 miles.Heck,he's gone 30,000 miles between his last 3 oil changes and can't believe what I'm going through. I don't care if I put 100 yards a day on the odometer.Short,long,hard trips,who cares? 26,000 miles and the engine is worse for wear than a 30 year-old corolla with 10 times the miles? Anyone with this model year Sienna who hasn't had the problem yet? Have patience,because your turn is coming.I'm very maintenance intensive,and refuse to let anyone else touch my vehicles,so I could care less about Toyota's b.s. warranty. But,ANYTHING that gets this kind of SLUDGE in less than two years is one MAJOR piece of JUNK!!!!!