flymore Posted March 7 Report Share Posted March 7 Is there a drain plug on the 2018 RDU? My 2018 PTU has a drain plug. Did they put a drain plug on the RDU in 2018? Videos on the subject show a pump out by hand from the fill plug and not getting all the old fluid out. Thanks 1 Quote Link to comment Share on other sites More sharing options...
1004ron Posted March 7 Report Share Posted March 7 There isn't one on my 2017 and don't expect one on the 2018. 1 Quote Link to comment Share on other sites More sharing options...
Haz Posted March 7 Report Share Posted March 7 (edited) 2015-2018 Edge Workshop Manual - Rear Differential Unit (RDU) - Filler Plug ONLY 2019-2024 Edge Workshop Manual - Rear Drive Unit (RDU) - Filler Plug 2019-2024 Edge Workshop Manual - Rear Drive Unit (RDU) - Drain Plug 2007-2014 Edge Workshop Manual - Rear Differential Unit (RDU) - Filler Plug ONLY Good luck! Edited March 10 by Haz 2 1 Quote Link to comment Share on other sites More sharing options...
1004ron Posted March 7 Report Share Posted March 7 This is what I use for extracting the RDU oil. I made the shepherds hook/candy cane with a wire coat hanger inside some silicone tubing, used with my BMW oil extractor. 3 1 Quote Link to comment Share on other sites More sharing options...
flymore Posted March 8 Author Report Share Posted March 8 Ok, that's what I was looking for. Hoping the fluid change will prevent a RDU failure. Thanks Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 9 Report Share Posted March 9 Just curious to know what fluid is used in the RDU and is there a better aftermarket alternative. I plan on doing mine soon. Also the same question for the PTU. I think they are different fluids??? Quote Link to comment Share on other sites More sharing options...
Biker Posted March 10 Report Share Posted March 10 If the RDU fluid is the same as my 2019, you may want to sit down before you see the price. Thankfully it doesn't take much. It was different than the PTU fluid for my 2019. Quote Link to comment Share on other sites More sharing options...
flymore Posted March 10 Author Report Share Posted March 10 On 3/7/2025 at 9:13 AM, 1004ron said: This is what I use for extracting the RDU oil. I made the shepherds hook/candy cane with a wire coat hanger inside some silicone tubing, used with my BMW oil extractor. Not sure what diameter of silicone tube you're using, the only tube I could get to fit was 1/4 inch. The RDU is packed tight with gears and a big one right behind the fill plug opening. It took me three stores to find SAE 80w-90. Finally settled on Lucas SAE 80w-90 heavy duty gear oil. Thanks Quote Link to comment Share on other sites More sharing options...
1004ron Posted March 10 Report Share Posted March 10 (edited) Had to wait until I got home to measure it. Silicone Tube 5mm ID x 8mm OD 1.64' Flexible Silicone Rubber Tubing I use Amsoil for the PTU and RDU. Edited March 10 by 1004ron Quote Link to comment Share on other sites More sharing options...
flymore Posted March 11 Author Report Share Posted March 11 That tube you used is a little bigger than what I had on-hand. Next time I'll give it a try. I used AMSOL in my last PTU change and I've got Motorcraft ready for the next. I was late on the RDU and wanted to get it done because there are mentions of RDU failure/replacements here and on youtube. The fluid I took out was really bad. Another thing I noticed is the rust and pitting on the exhaust pipe from my cat on back to the muffler. Isn't this supposed to be stainless? Looks like it will fail soon and I'll need a new pipe and muffler. Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 11 Report Share Posted March 11 OK. I am going to use Amsoil for both. But are they different? Which one do I use in the RDU? PTU? Thanks so much guys for all your help. Quote Link to comment Share on other sites More sharing options...
flymore Posted March 11 Author Report Share Posted March 11 Check your owners manual. Mine says SAE 80w-90 for RDU and SAE 75w-140 for PTU Quote Link to comment Share on other sites More sharing options...
Haz Posted March 11 Report Share Posted March 11 (edited) @STBEAST: From the 2022-2024 Edge Workshop Manual, including Power Transfer Unit (PTU) drain & fill procedure attached below as a PDF document... Good luck! Power Transfer Unit Draining and Filling - 2.7L EcoBoost - General Procedures - 2022-2024 Edge Workshop Manual.pdf Edited March 11 by Haz 1 Quote Link to comment Share on other sites More sharing options...
1004ron Posted March 11 Report Share Posted March 11 10 hours ago, STBEAST said: OK. I am going to use Amsoil for both. But are they different? Which one do I use in the RDU? PTU? Thanks so much guys for all your help. That depends on the Model/Year. Please add your M/Y to your profile signature - Settings - Ford Edge Forum Amsoil is a good brand, but there's many others as well. Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 11 Report Share Posted March 11 (edited) Ok I have a 2024 Edge ST. For some reason I could not find it in the digital owner's manual in the vehicle, but I will check again. Sure miss the 'old school' printed manual ! Thanks for the help Edited March 11 by STBEAST Quote Link to comment Share on other sites More sharing options...
Haz Posted March 11 Report Share Posted March 11 @STBEAST: 2024 Ford Edge Owner's Manual (PDF direct download link) Good luck! 1 Quote Link to comment Share on other sites More sharing options...
1004ron Posted March 11 Report Share Posted March 11 I find the electronic/digital version way more useful mainly for the word search, and don't need my reading glasses. 1 Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 12 Report Share Posted March 12 (edited) Thank you Haz! Much appreciated. Jim Edited March 12 by STBEAST 1 Quote Link to comment Share on other sites More sharing options...
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