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Add me to the list of sludged Sienna owners. The purchase of this vehicle was, by far, the biggest investment my family has made and is also the only new vehicle we have ever purchased. With our previous vehicles, I had fallen into the habit of changing the motor oil every 3,000. I had intended to do the same with our new baby. But behold the manufacture's manual which stated that our driving conditions merited an oil change every 7,500 miles. Wow!!! I'm thinking that these Toyota with their well respected reputation and superior engineering are so well-built that oil changes are unnecessary until 7,500 miles. It made perfect sense to us. That's why we are paying a premium to drive such a superb vehicle. Boy, we were in for a shock. At about 28k miles a little light blue smoke starting coming out of the tailpipe. This occurred just as the weather was starting to turn cool. Of course I'm thinking its because of the cool weather. It only worsened. As you might have surmised, I am now ...