Sythetic transmission fluid and transaxle fluid
 

Re: Santa Fe 3.5L AWD

Can anyone tell me how often synthetic tranny and trans axle fluids should be changed?

I have an 04 SF and at 126K miles, I changed out the transmission, and transfer case oils with synthetic.

I assume you have an automatic transmission. Transmission and transaxle fluid are the same thing.

You should change it every 30k. Not flush it, just drop whatever is in the pan and replace it. If you never changed it, I would change it about four times after 126k miles. Change it, drive around for a week, change it again, etc.

Yes, it should be changed every 30K miles however, you do want to flush it. Draining the pan only gets out a small portion of the fluid.

Do you only drain half your oil when it change your oil? Then why would you only drain half your trans fluid?

I was talking with a mechanic w/ 30 years experience only yesterday, and he agrees with me: Don't do flushes. The flushes use solvents. The solvents can loosen gunk and toast the valve bodies. Do changes. First change - 50% new fluid, second change - 25%, etc.

He said he just had a guy demand a flush, and he turned the guy down. Seems his car had 99k miles and never had a change. He didn't want the liability so he turned him down.

^^^ INCORRECT.

Once again I will explain this. ENGINE OIL flushes use solvents that loosen gunk. TRANSMISSION flushes just use an external tank of fresh trans fluid to pump into the trans while the old trans fluid is pumped out. There are no solvents used in transmission flushes.

However, there are different types of transmission flushes. One uses high pressure to force fluid in the reverse direction. This is the type to avoid. The other is type of flush is the one that just uses the pump in the transmission to normally pump (pressure and direction) the old fluid out and clean fluid in via the trans cooler lines. This is the type to do.

Sorry, but your wrong. There are trans flushes with solvents. The shop I usually frequent in Maryland used it.

Yes, solvents CAN be used but it's optional and not a good idea in my opinion. Any shop that does use solvents is not very good one.

How a REAL transmission flush works:
http://www.wisegeek.com/what-is-a-tr...sion-flush.htm
http://www.aa1car.com/library/2004/bf100456.htm

Hello i live in venezuela and the hyundai dealer here recomended partial flush and they put in d III is that good ?

What year Santa Fe? And what do you mean by "d III"? If that
s Dexron 3, no, that's bad. Depending on what year Santa Fe you need SP-III.