So, after extensive research I decided to get rid of recently changed DW1 atf, and replace it with Valvoline Maxlife atf. Did the first drain&fill, and noticed difference right away. Now I can cruise around the city @ 60km/h ( 40 mi/h ) while having 1600rpm on tachometer. That never happened before. Before this first drain/fill, I used to see about 1900-2000 on my tachometer, at the same speed. I did suspect that clutch plates in my trans are worn out, ( 130k miles on odometer ), because I did have a feeling that 3rd and 4th gears are slipping, this is why I did 4 drain&fills on the first place with Honda DW1. Now, with only 1st drain&fill with Valvoline ATF, van drives different, and RPMs have changed. This is my first Odyssey, and I had no idea what RPMs I should have at 40mph/60kmh.
So, now I am asking happy Odyssey owners: if you think that your transmission works perfectly, please let me know whats your RPMs at 40mph/60kmh. Thank you.
Tomorrow I will do another drain&fill, will see what happens.
UPDATE.
One last update on Valvoline Maxlife and Lubegard use.
First of all, I have to explain that this Odyssey is my first Odyssey. I did have some Civics and Accords, but these are totally different vehicles, and they shift gears differently.
So, basically I didn't know how Odyssey supposed to shift gears properly.
I bought my Odyssey used and abused, trans was shifting really bad, banging on downshifts, and slipping.
So, I tried to fix it without spending a lot of money for it.
First, changed ATF, used 12 quarts of Honda DW1, 4 drain/fills. To my surprise, slippage got way worse.
Then, after reading about DW1's friction modifiers, I tried to replace it with Valvoline Maxlife.
It did fix slippage, not completely, but I didn't really know how it suppose to work properly, so to me it seemed kinda fixed.
Banging downshifting was still there. So I tried Lubegard. It did help for a while, but problem would comeback after a month or less.
I tried to reset ECU, it seemed to help, but not for long either.
Tried to clean up trans with Seafoam cleaner. No result.
Replaced all 3 pressure switches. No result.
As a last resort, I replaced all 4 shift solenoids. There wasn't any transmission related codes indicating bad solenoids, but still I decided to try this last thing, before taking van to trans shop.
That was it. Now I know how Odyssey transmission supposed to shift properly. No slippage at all, no banging downshifting. Crisp pronounced upshifts and downshifts. 4th gear locking a bit late, but that's acceptable.
I don't know how long this transmission is going to last, because clutch packs are probably half dead. But for now, van drives perfectly.
So, now I am asking happy Odyssey owners: if you think that your transmission works perfectly, please let me know whats your RPMs at 40mph/60kmh. Thank you.
Tomorrow I will do another drain&fill, will see what happens.
UPDATE.
One last update on Valvoline Maxlife and Lubegard use.
First of all, I have to explain that this Odyssey is my first Odyssey. I did have some Civics and Accords, but these are totally different vehicles, and they shift gears differently.
So, basically I didn't know how Odyssey supposed to shift gears properly.
I bought my Odyssey used and abused, trans was shifting really bad, banging on downshifts, and slipping.
So, I tried to fix it without spending a lot of money for it.
First, changed ATF, used 12 quarts of Honda DW1, 4 drain/fills. To my surprise, slippage got way worse.
Then, after reading about DW1's friction modifiers, I tried to replace it with Valvoline Maxlife.
It did fix slippage, not completely, but I didn't really know how it suppose to work properly, so to me it seemed kinda fixed.
Banging downshifting was still there. So I tried Lubegard. It did help for a while, but problem would comeback after a month or less.
I tried to reset ECU, it seemed to help, but not for long either.
Tried to clean up trans with Seafoam cleaner. No result.
Replaced all 3 pressure switches. No result.
As a last resort, I replaced all 4 shift solenoids. There wasn't any transmission related codes indicating bad solenoids, but still I decided to try this last thing, before taking van to trans shop.
That was it. Now I know how Odyssey transmission supposed to shift properly. No slippage at all, no banging downshifting. Crisp pronounced upshifts and downshifts. 4th gear locking a bit late, but that's acceptable.
I don't know how long this transmission is going to last, because clutch packs are probably half dead. But for now, van drives perfectly.