Transmission Fluid/Oil change?

[Husam]

With a 3.8L v6 2015 sedan, about 75k miles on, I am considering changing the transmission fluid. I know that the owners manual states that this can be done under "severe" driving conditions, but I live in a considerably hot environment and I've started to notice minor transmission performance issues.
Has anyone done it? if yes, what's your experience after the transmission fluid change? Let me know please.

Should i also consider checking and/or changing the differential fluid too?

Thanks!

 

[carguy75]

I would change the differential fluid. I changed my gear oil at 60k miles and the fluid looked and smelled used. It was not the worst used gear oil I seen, but it did need changing.

I will just change my plastic transmission pan in my 2015 5.0 model at 70k miles so that I also change the built-in transmission filter and repeat when the Genesis reach 140k miles and so fourth. The pan/filter only cost about $140. Good insurance for anyone planning on keeping the Genesis long-term after 100k miles like myself.

 

[jimbo1mcm]

I just completed a transmission fluid change on my 2016 Genesis 3.8 AWD. I purchased a MotivPro fluid exchange device for about $90. I did this in my garage. I jacked up my car as high as I could on a ramp in the front and a floor jack under the rear differential to get it level. I removed the rear transmission cover, then used an 8mm allen wrench to open the fill hole on the left side ( looking from the rear ). I needed an extension since it was very tight. I had to remove the 2 10mm bolts and push the shift lever linkage up. I couldn't get an 8mm socket in there because the exhaust pipe was in the way. ( might be different on a V8 ). I then drained the transmission with the plug on the bottom. I got out 4 qts and 2 oz. The drain plug has a rubber o ring which I didn't have, so I just re-installed it and torqued it to 24nm. I then added fluid in the fill hole on the left side. The MotivPro has a u shaped hook that allows you to slip it in the fill hole and add fluid. It added very slowly. I stopped when it was coming out the hole. It took just about 4 quarts. I put a new aluminum washer on the fill hole and tightened it gutandtight since I couldn't get a torque wrench in there. This whole process took over a day because I was doing the low crawl and it was very difficult to work under the car. Since the tranny takes over 10 qts, you can never get it all out in one shot, unless you go to a BG Flush machine, during which they usually undo the transmission lines at the cooler in front and run it through their machine. You can get the full amount of fluid in using this method. I ran the car for about 1,000 miles, then took it to my dealer, who I have a good relationship with, and he put it up on the lift and drained and added another 4 quarts plus, while I had a cup of coffee. Much easier. I have 41,000 on my car and plan to keep it for a long time. I will do this again around 80,000 miles. I bought the Hyundai spec oil on line and brought it to the dealer, saving a bunch of money. good luck.

 

[carguy75]

I just completed a transmission fluid change on my 2016 Genesis 3.8 AWD. I purchased a MotivPro fluid exchange device for about $90. I did this in my garage. I jacked up my car as high as I could on a ramp in the front and a floor jack under the rear differential to get it level. I removed the rear transmission cover, then used an 8mm allen wrench to open the fill hole on the left side ( looking from the rear ). I needed an extension since it was very tight. I had to remove the 2 10mm bolts and push the shift lever linkage up. I couldn't get an 8mm socket in there because the exhaust pipe was in the way. ( might be different on a V8 ). I then drained the transmission with the plug on the bottom. I got out 4 qts and 2 oz. The drain plug has a rubber o ring which I didn't have, so I just re-installed it and torqued it to 24nm. I then added fluid in the fill hole on the left side. The MotivPro has a u shaped hook that allows you to slip it in the fill hole and add fluid. It added very slowly. I stopped when it was coming out the hole. It took just about 4 quarts. I put a new aluminum washer on the fill hole and tightened it gutandtight since I couldn't get a torque wrench in there. This whole process took over a day because I was doing the low crawl and it was very difficult to work under the car. Since the tranny takes over 10 qts, you can never get it all out in one shot, unless you go to a BG Flush machine, during which they usually undo the transmission lines at the cooler in front and run it through their machine. You can get the full amount of fluid in using this method. I ran the car for about 1,000 miles, then took it to my dealer, who I have a good relationship with, and he put it up on the lift and drained and added another 4 quarts plus, while I had a cup of coffee. Much easier. I have 41,000 on my car and plan to keep it for a long time. I will do this again around 80,000 miles. I bought the Hyundai spec oil on line and brought it to the dealer, saving a bunch of money. good luck.

Sounds about right. The pan holds about 4 quarts , the torque convertor holds another 4 quarts or so, and the transmission cooler/lines holds about 2 quarts. It will take a couple drain and fills to remove most of the old fluid.

I expect to do a drain and fill twice after a week apart or so to get most of the old fluid out of the system and then repeat 70k miles later. I do a similar transmission service on my other cars as well, however I do have a garage and the correct tools so no big deal to me.