MilwaukeeDave

iTrader: (3)

Whats the difference between the two?

gold2003tl (90)

dw-1 is thinner, and part synthetic. z1 has been discontinued. dw-1 is backwards compatible with z1.

i currently have dw-1 in my tranny, and iv noticed much improved cold weather shifting, overall quicker and smoother shifting, along with cooler temps under the hood. i have only positive things to say about dw-1.

although i would not use dw-1 in a tranny that is already slipping, as it will most likely get worse after some time.

01tl4tl

if its already slipping, there is nothing oil would do to help~

you may still find a few quarts of z1 on an import parts store shelf
otherwise honda/acura dealers are sold out and carry the new stuff DW-1
Its a buck or 2 cheaper at honda for the exact same stuff

RC99TL

I have a 92 Accord EX with 235k. (Peeking out behind the TL in my avatar). The trans had a slight shudder when going into second.
Did a fluid change a few weeks ago and the shudder is gone.
In my opinion whatever Honda spent to reengineer their trans fluid was worth every penny (especially in warranty repairs!).

MilwaukeeDave

iTrader: (3)

RC99 did you use DW1 when you changed the fluid?

RC99TL

Hi,
Yes I put in just a touch under 3 qts DW-1.
I was going to cycle through 9 qts in 3 more changes if there wasn't any drop in performance. That one change made the trans shift more precisely and the shudder is gone. I will do the remaining changes to evacuate the remaining fluid.
Keep you posted.
My 99 TL shifts better than new with DW-1 - I bet/hope everyone says the same.