Join Date: Jul 2011
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Origin of the 3x drain and fill, do not flush transmission
Last weekend I bought a certified used 09 Accord EX-L with 45,000 miles. During the certification inspection the dealer performed a 1x drain and fill with Honda ATF Z1.
I don't want to get into a Z1 vs. DW1 argument.
I have heard a 1x drain and fill is acceptable, but that most people do a 3x drain and fill. I know it is supposed to get out more of the old fluid doing it 3x.
Do people do this 3x vs. 1x just for peace of mind and (relatively) cheap insurance for their transmission? The manual just states to replace the transmission fluid without any more direction than that. And their seems to be a difference of opinion between what the dealership does and the DIYer's.
Normally that wouldn't surprise me at all, but in this case the dealership seems to go with the easier, cheaper option. You would think they would want to do a 3x drain and fill to sell more fluid, and charge more labor if it were at all justifiable.
Maybe I'm looking for an excuse to go buy some DW-1 and do another drain and fill or two, but it just doesn't make sense to me why these different opinions exist, and why the owners manual or Honda won't be more specific about this importance piece of maintenance.
Any one have any thoughts about this?