Originally Posted By: doublebase
Although I do think simple drain and fills are fine - and it's all I ever did for my Honda Accord, I disagree that a flush machine won't exchange all the fluid.
I've used flush machines before and it appeared to me that all the fluid looked like it got flushed out (the machine I had dispersed the old fluid into another container where you could clearly see the color of the old fluid change to new as it reached 8-10 quarts or so.
The fluid is constantly being mixed during an exchange. There's not a magical barrier that is formed by the new fluid to push the old out. The BG machine will put 16 quarts through the system. I think it works well but it's definitely not going to get ALL the old fluid out A transaxle with a 6 quart total capacity is going to end up with a much better old/new fluid ratio than a torqueshift with a total capacity of 17.5 qts.
Although I do think simple drain and fills are fine - and it's all I ever did for my Honda Accord, I disagree that a flush machine won't exchange all the fluid.
I've used flush machines before and it appeared to me that all the fluid looked like it got flushed out (the machine I had dispersed the old fluid into another container where you could clearly see the color of the old fluid change to new as it reached 8-10 quarts or so.
The fluid is constantly being mixed during an exchange. There's not a magical barrier that is formed by the new fluid to push the old out. The BG machine will put 16 quarts through the system. I think it works well but it's definitely not going to get ALL the old fluid out A transaxle with a 6 quart total capacity is going to end up with a much better old/new fluid ratio than a torqueshift with a total capacity of 17.5 qts.