I was planning on taking my wife 13 grand caravan up to our local mechanic and have them flush it and install new atf+4. The van has 104,000 miles and since we bought it recently I figured it would be wise to flush it and then drain and refill every 30k after that. I posted on a local caravan Facebook page and was told not to use the flush machine. What do you guys think? The van was originally owned by enterprise and then by a children's home before we bought it so the maintenance was kept up on it. The fluid doesn't look real dark or anything just looks like about what it should look like when a maintenance conscience person would plan on change it.