i was investigating changing my tranny oil, and some places are telling me that if i just drain and refil the tranny fluid only 30% of the fluid will be replaced. is this true? they tell me that they have to hook it up to a machine to replace all the tranny fliud. is this true for HONDA too? or only for domestic cars?

 

In an auto yes. Manual not 30%.

Either way you'll never get all the fluid out. Even on an engine oil change you only get 80-90% of the old oil out.

 

What I do is change tranny fluid, clean off magnetic plug. Drive around a few days. And repeat. Just do this more often than recommended.

 

yep, the atp is pretty cheap.
usually do it twice or 3 times..
sometime people change the atp everytime they change motoroil.

 

Yep, a ton of atf fluid gets caught up in the converter of auto's and also in the factory tranny cooler if present in that application.

 

I change my mom's for her every other oil change and the fluid is NEVER nice and red like the new fluid, even after flushing 4 times after 15 mile hard driving trips, Honda auto trannies are the weakest link. Also the filter, at least on the 98 v-6's is not serviceable and is considered a life of the transmisison type of part, I guess the life isn't that long so that's OK.

 

take it to a Honda dealer that has a tranny flush machine. they hook the machine to the cooler lines on the transmission and let the tranny pump push out all the old fluid and suck in new fluid at the same time.

If honda does not do it Jiffy Lube will and it is the BEST $70 you can spend after the fluid change add one bottle of LUBE GUARD and you are all set

I have it done on 3 cars with auto's and the trannies have outlasted the engines in ALL OF THE CARS

 

how often would i change the tranny oil if i change it with the tranny flush machine?