Interestingly in my owner's manual for the Avalon it specifies either 5,000 or 10,000 mile oil changes depending on how the car is used until 100,000 miles. Then it says to just do 10,000 mile oil changes from there on out.
However, I drive short distances, over mountains, in the winter, I tow with the Avalon, etc. etc. And according to the owner's manual, before 100,000 miles that means I'm supposed to do the 5,000-miles/6-month oil change. That is what is recommended by Toyota. That is what I do. Well, it's no longer what's recommened because after 100,000 miles it goes to every 10,000 miles regardless, and then the mainenance schedule ends at 120,000 miles.
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