jcartwright99 Posted October 4, 2019 Share Posted October 4, 2019 I have been pretty good about the maintenance for my 2017 Fusion. I did have a question though. What if any kind of maintenance does the rear differential require? I am assuming at some point I should change the fluid. I tend to follow a more severe maintenance schedule since I spend a lot of time in stop and go traffic. Quote Link to comment Share on other sites More sharing options...
akirby Posted October 4, 2019 Share Posted October 4, 2019 The PTU is more of a concern than the rear diff. It's also considerably more difficult to change since Ford thinks it's a 150K item. I think 30K on the PTU fluid is a safe bet but the rear diff could probably go 60K or longer - I don't think it's a problem area. What does the OM say? Quote Link to comment Share on other sites More sharing options...
bbf2530 Posted October 4, 2019 Share Posted October 4, 2019 33 minutes ago, jcartwright99 said: I have been pretty good about the maintenance for my 2017 Fusion. I did have a question though. What if any kind of maintenance does the rear differential require? I am assuming at some point I should change the fluid. I tend to follow a more severe maintenance schedule since I spend a lot of time in stop and go traffic. Hi jcartwright. If I remember correctly, there is no "Scheduled maintenance" of the differential. However, many owners change the fluid at 50,000 miles. Some even earlier, like 30,000. Of course, some never do. I change mine at 50,000 miles. For the transmission itself, "Scheduled maintenance" is at 150,000 miles. I change mine at 75,000. Good luck. Quote Link to comment Share on other sites More sharing options...
jcartwright99 Posted October 4, 2019 Author Share Posted October 4, 2019 I recently changed the PTU fluid at 40k. Already flushed the trans around 35k. I will probably changed the rear differential at 50. I'll probably follow those intervals the next time I change. I may just do a drain and fill on the trans next time though. Quote Link to comment Share on other sites More sharing options...
akirby Posted October 4, 2019 Share Posted October 4, 2019 1 hour ago, jcartwright99 said: I recently changed the PTU fluid at 40k. Already flushed the trans around 35k. I will probably changed the rear differential at 50. I'll probably follow those intervals the next time I change. I may just do a drain and fill on the trans next time though. You can easily do a 3x drain and fill on the 6F35 (drain, refill, drive a few days, repeat). That gets most of the old fluid out. Quote Link to comment Share on other sites More sharing options...
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