Originally Posted By: chad8
That year sienna is not the sludge motor
Correct.
Originally Posted By: chad8
What kind of oil and changes are you using ?
Good question to answer. I noticed the oil type used, but not the usual interval.
Those deposits at the fill hole aren't an indicator of sludge, I can't actually see inside at all.
A friend of mine has a 2004 Sienna, negligible oil consumption with 5w30 SOPUS synthetic oils (PP and QHP) at 8,000 mile intervals including short trips in the winter. It has about 75k miles.