Well a few days back I sent the wife into town to get transmission fluid for our 2005 equinox she came back with dexron 6 she said that's what they told her to put in it so I didn't question it didn't even bother looking at the owner's manual I have trusted this auto parts store for a lot of years it's owned by someone I've considered a friend for a long time at any rate just days after changing the fluid I get in the car to go to town and I'm here in a really unusual noise kind of a high pitch but yet no tone growling noise I was rather dumbfounded I couldn't make out if it was the muffler or whether it was the transmission so I took the vehicle to exhaust pros and they found a leak in my exhaust where someone had tried to weld it and missed the spot anyway I drove it home but I could still hear that same odd, so I decided to seek further advice because it seems that after I found the manual and the manual says only t 6 transmission fluid should be used seems that nobody at Napa had ever heard of such a transmission fluid they tried to cross reference it and came up with the dexron 6 so I went to the Chevy dealership and the Chevy dealership seemed just as baffled so while standing at the parts counter one of their mechanics came in he claims that all GM vehicles use dexron 6 so I bought more dexron 6 replace what was in the transmission with new transmission fluid again figuring that there may have been some old transmission fluid that was in the torque converter that contaminated the transmission fluid that I just put in so I changed it again as I said the noise got quieter but it is still there I found the t6 transmission fluid online and it would appear that Toyota and some other cars from Asia used this type of transmission fluid so I got to thinking maybe that transmission is a Toyota a Nissan one of them Asian vehicles transmissions and then I went back to the owner's manual again and it says only t6 the question is is it safe to leave what I have in there and will the noise eventually dissipate has it seems to have done already or should I not drive it get rid of what's in there and replace it with the t6 before I completely destroy it the transmission any help would be greatly appreciated