I’ve got a 2008 Touring Honda Odyssey, it is at 70,000 miles so relatively super early for a transmission to be slipping. It wasn’t slipping when I first got it, but I took it to honda for a transmission service, and it started slipping. What should I do to fix this slipping? I believe they flushed the fluid, which they said was fine to do(I shouldn’t have believed them) and then they filled it up with Valvoline ATF, I don’t understand why they wouldn’t use DW-1. Overall just curious what my best course of action would be to fix this issue.
Thanks
it is at 70,000 miles so relatively super early for a transmission to be slipping
Not if it hasn't be serviced or has otherwise been abused, or the mileage (which is suspiciously low) is not accurate. Also, according to Scotty the transmissions in the Odyssey (especially older models) are known to be weak.
I believe they flushed the fluid, which they said was fine to do
Chances are there's your problem. Scotty and others have warned that power flushing can cause transmission failure. You should not be taking a 17-year-old vehicle to the dealer for service.
then they filled it up with Valvoline ATF
Worse yet. Hondas of that vintage are very particular about transmission fluid.
I don’t understand why they wouldn’t use DW-1
The Valvoline is probably cheaper, and usually the dealer would be working on newer model Hondas that might not be as picky about transmission fluid or at least would not develop symptoms for some time.
Overall just curious what my best course of action would be to fix this issue.
Bear in mind that we don't know that specific dealer and can't see inside your transmission so the following is essentially a "best guess"...
The dealer is very likely not going to accept responsibility and it would be very difficult to prove otherwise, especially on a vehicle that old. You would probably have to take them to court and would need a transmission expert to testify on your behalf, not to mention a lawyer.
You could try replacing the Valvoline fluid with DW-1 but given that the transmission was flushed the damage has probably already been done. Might be worth a try, it could just be that the Valvoline's friction qualities don't match up with what that transmission needs. (Multiple drain and fill, or fluid exchange, not another flush.)
If the transmission has been damaged internally the only way to "fix" the issue is to have a remanufactured transmission installed. That would probably cost more than the vehicle is worth. A snake-oil type product like Lucas or Trans-Medic might help temporarily but it's a crap shoot and might make things worse.
@chucktobias Thanks, so I think my idea of a flush might’ve been skewed because they said they did a flush but they did say they’d be doing drain and fills, but only driving a few miles in between the drain and fills, not a power flush but that. If I try and replace it with DW-1, should I just drive a few miles in between the drain and fills? Also the reason the miles are so low is because it was owned by only one couple and after they bought it, it just sat there most of the time because they couldn’t drive much being they were an older couple.
Yes, drive around a while (maybe 15-20 minutes) between each drain and fill operation. You want the replacement fluid to thoroughly mix in. After doing this 4 times you will have replaced about 90% of the fluid.