Nice video, i just did it in my own m340 G21. I highly recommend use ISTA and perform the transfer case service program. In that way the bmw diagnostic tool opens a valve in between the chambers inside the transfer case, so that more oil can be sucked out. I managed to get 700 ML out of the system.
Interesting about its service mode. I did some research before attending this, and xHP (a tool/company that does BMW ZF transmission tuning) recommends not to reset transfer case adaptation after changing the transfer case fluid. That’s why I didn’t even bother to try plugging in my computer to run ISTA 😅
Honestly, it sure looks clear still. I’d say 80k km/50k mi is a good start. That’s when I changed the tcase fluid previously on my F30. Car ran fine till I traded it in.
Different design of systems between transfer case and the front/rear differentials. The diffs have a spacious opening for us to feed a way larger diameter hose down, should you choose to siphon out the old fluid. Whereas, on the transfer case, you are “forced” to use a hose that has a way smaller diameter. As well, the transfer case opening has an awkward angle for us to aim at to feed the hose down.
@@TandeGarage I’d do it myself but i don’t want to only get 30% of the old fluid out, what are the chances you got so little out because some of it just burned away? When I did my front diff there was like almost less than half old left (I know not good lol)
I don’t think that some was burned away per se. More like I didn’t have the patience to get as much out as I could. When I was changing the TC fluid and making this video, I was rushing (in a way) to get it done, as I needed the transmission fluid to be changed and the car to be ready to go the next day. If I had more time to do it again, and knew that I needed a hose smaller in diameter, I should’ve been able to siphon more fluid out of the TC.
@@TandeGarage alright good to know that it’s doable with more patience, thank you, you’ve helped me out a lot with my 2020 g20 330ix thus far, 92k miles and 0 issues (even with my stage 2 tune).
It’s a relatively small reservoir, and BMW only sells their DTF1 in 1L bottle. That should be more than enough for at least 1 drain and fill. For the fill plug, I would advise getting a new one since the seal could break on removal. If the seal isn’t ripped, you MAY be able to get away with the old plug.
