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Time to drain fill my Wifes' 04 with 50K miles... transfluid.
Dealers ZW1 is 11$ a jug. I'm cheap by nature
ANY.. point in buying a Gallon of Mobil Trans fluid ?? label claims ZWI compatible.
Or just a foolish try at saving 10$ ?

 
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Use the Honda trans fluid. This is one area that you don't wanna get cheap on…

 
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Thank you.. Just came back from the dealers.. a bit lighter of wallet though :-) Didn't realise that Ali drain plug washer was 5$ tho !.
Slightly smaller Oil one is 90 cents.

 
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The Honda ATF is DW-1. Only use this ATF. You might want to do another drain and fill since you only have 50K and most likely have the old Honda ATF Z-1 in the trans. DW-1 is synthetic.

 
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There isn't anything wrong with having some ATF Z1 in a car that was originally designed to use it. All you can buy these days is ATF DW1. You can pour DW1 into a car designed for Z1, but they don't recommend Z1 into any car newer than 2010. I have around 6 qts of Z1 still in my private stash and wouldn't hesitate to use it in an older honda.

I have been told by Honda corporate tech staff that the DW1 has much much better lubrication properties compared to the Z1 and that is the major difference between them. I personally have never seen anything that refers to DW1 as synthetic, but I will spend a couple minutes looking later at the release notes from 2009 to see what it says about it.


I checked the old service news and it doesn't say anything about my lubrication theory or synthetic base stock. All it says in the release news was that it was a better performing fluid when cold which would result in increase fuel economy.

 
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not a DIY article, so moving to correct section

 
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is saving 10 bucks worth the risk?....IMO no

also....the metal washer on the drain plug can be reused, i have never replaced mine in 12 years, it still doesn't leak