> Yea, what about this "backflushing" thing we hear about now. I am
> fairly new to automatic transmissions. My Subaru is a auto and I'm wondering
> about this in lew of changing the filter. Also isnt it true on some cars(most)
> you can't even get all the old oil out of the trans. The Mercedes has a plug
> to pull on the torque converter, so if we drain that and the pan do we get most
> all out? But what about cars that dont have those drains? Max
I think it really varies from one make to the next. I have a 2005 Honda Odyssey van, which has a transmission drain plug (but not a filter!!). Despite having a drain plug, there are so many nooks and crannies in the A/T that draining it out by the plug only empties a little over half of the fluid.
The official Honda procedure is to drain and fill, run it a little, and repeat three times. So at the end you have 7/8ths new fluid (or 15/16ths new fluid; I forget if you do three or four drains/refills). Seems like an odd design to me, but that's what is in the factory manual.
- Alan
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