Reading the owner's manual on replacing the transmission fluid on my Fit, I learned you are not supposed to flush the fluid, but rather do 3 fluid replacements with 100 miles between each replacement. My Honda dealer says they do it in one sitting, costing me $350 +/-. I assume they are flushing it. Is that correct, and if so, is the user allowed to do the same?
TIA, hukjeff

 

Lots of threads on this, take a gander below at the "Related Topics" section. Should give you a good start.

 

This is correct. Honda doesn't endorse using a flush machine but DOES recommend doing the 3x drain & refill.

This has been a procedure done on with DW1 filled V6 vehicles in the model year range of 2011 to 2019 experiencing torque converter like judder (there are service bulletins regarding this too). From what I've seen, that judder tends to show after ATF DW1 begins to degrade 3 years or 45k miles into its service life.

The 3 time drain and refill also has the individual performing the work run the vehicle through its gears while on the lift and gets the ATF nice and hot, allowing more a more thorough drain. As an option, you can also replace the external transmission filter (part number - 25430-PLR-003) be replaced after the final drain as well.

Following this, most folk would swear by using Honda ATF DW1 but would like to note that DW1 has been known to have a lower flash point than ATF Z1 that has replaced it. If you're up for doing some research, you may want to consider AmSoil's Signature Series ATF or one of Redline's ATF options. I personally run AmSoil's Signature Series ATF in my GD3 used for autocross and don't see any issues. The ATF tolerates heat much better than DW1 as well as retains surprisingly civil shift quality for daily driving/commuting.

As you do your research, keep an eye on a few of my posts regarding this subject. In some of them I attached a picture of a chart listing various ATFs along with Honda's that show their fluid viscosities at X temperatures.

 

I use the noob method. It is faster and doesn't waste all that expensive fluid, and you don't mix old fluid in.

https://www.fitfreak.net/forums/2nd-...ill-flush.html