Well, I just picked up a 2006 Odyssey with 136k. Changed oil/filter and 4x drain and fill for the tranny on the first day. Trans fluid looked like Texas Tea. Now it seems to run pretty well, shifts nice and smooth. I don't know what oil it had in it, probably something very cheap, and non-synthetic. I replaced with a PureOne 14610 and Pennzoil Platinum (non-PurePlus). I'm not super thrilled about the wear metals, although they are not that far out of line from universal averages. One thing I was surprised about was that it has a K&N, which hasn't been cleaned in probably 25k (or more) and the numbers for silicon especially are pretty low I think. I guess I'm spoiled from my Fusion where the highest wear metal is around 7-8 ppm. Oh well, it's a start.
) and I'm thinking about dumping it and changing just to try to keep the cleaning going. The other reason is since it's starting to get cold, and I have no garage or lift... and don't feel like laying in the snow whenever it comes at ~7k. 
