Connie
Well-Known Member
In order to try to prolong the longevity of the transmission, I have been doing a drain and fill with 3 quarts of DW-1 every year. It is probably overkill since I only drive about 7k miles a year and take the train to work, but I figure it is cheap insurance. I also found it much cheaper to buy the DW-1 from my local Honda dealer by the case instead of buying 3 bottles at a time.
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Ever since my first transmission failed at 344k and was replaced with a junkyard unit of similar mileage, I've been doing a dw-1 drain and fill every 30k km, which works out to about twice a year for me.
It still shifts fine, and the trans in there has similar mileage to the car; >500k km. Costs about $30 Canadian for the 3 bottles of fluid from Honda. Like you said, cheap insurance.