I changed mine because it was getting old, not burnt. Keeping up on fluid changes is the best way to ensure your car keeps going a long time.

That makes sense. I'll change my fluid in the next couple months.

Anybody here think synthetic is worth it, or does a Bonneville do just as well with conventional lubricants?

... What Danthurs said. I followed the write-up, and I have never done a tranny fluid change before. I didn't spill one drop. However, Danthurs, you were right when you said those filter elements could be stubborn. Sheesh, you weren't kidding, it took me about an hour to worry it out. I dang nearly thought I was going to break something.

The only thing I did a little differently was to use a hand pump to remove a few quarts out first. This made the pan lighter and neater to remove.