STBEAST Posted July 17 Report Share Posted July 17 I have a 2024 Edge ST. I plan on doing fluid changes on both the PTU and RDU around 20K. From all the horror stories I have read (mostly PTU), do you think this is a good service interval and what fluid should I use. I have heard about this 'Red Line Shock Proof' being the best fluid but was hoping to get some feedback on this. Thanks so much for any advice. Jim Quote Link to comment Share on other sites More sharing options...
lildisco Posted July 17 Report Share Posted July 17 I'd check your Owners Manual & verify. Most of the horror stories are from the previous gens that didn't have 'serviceable' components. I believe that you're stuck with only 1 manufacturer, Motorcraft, that makes the RDU fluid, Motorcraft XY-75W-QL disconnect fluid. The PTU has more options available. Redline Lightweight Shockproof 75W140, aka Smurf Blood, is what I & many others use. Others prefer Amsoil. However, I'm not a Sport/ST so I don't know if they're different or not. I can tell you that I've changed both twice in 31,000 miles. The first fluid change on both had the most material in the oil. When I did the second time, things were much nicer. Both fluid changes are relatively cheap if you do them by yourself. The Motorcraft RDU fluid is ~$40/qt & Redline Lightweight Shockproof 75W140 is ~$25. Here's my thread on it, but I believe things are going to be slightly different on the ST. Quote Link to comment Share on other sites More sharing options...
garycrist Posted July 17 Report Share Posted July 17 With this new electronic "owner's manual" I have searched it and can't find any reference to what fluids go in the PTU or the RDU! So, I have the same questions. What fluid/s go into a 2022 Edge ST PTU and RDU? 1 Quote Link to comment Share on other sites More sharing options...
lildisco Posted July 17 Report Share Posted July 17 They're usually in the back under specifications. Mine was under rear axle Quote Link to comment Share on other sites More sharing options...
Tim W. AZ Posted July 17 Report Share Posted July 17 2 hours ago, lildisco said: I'd check your Owners Manual & verify. Most of the horror stories are from the previous gens that didn't have 'serviceable' components. I believe that you're stuck with only 1 manufacturer, Motorcraft, that makes the RDU fluid, Motorcraft XY-75W-QL disconnect fluid. The PTU has more options available. Redline Lightweight Shockproof 75W140, aka Smurf Blood, is what I & many others use. Others prefer Amsoil. However, I'm not a Sport/ST so I don't know if they're different or not. I can tell you that I've changed both twice in 31,000 miles. The first fluid change on both had the most material in the oil. When I did the second time, things were much nicer. Both fluid changes are relatively cheap if you do them by yourself. The Motorcraft RDU fluid is ~$40/qt & Redline Lightweight Shockproof 75W140 is ~$25. Here's my thread on it, but I believe things are going to be slightly different on the ST. They can't flatly deny a warranty claim if you use Motorcraft fluid. 1 Quote Link to comment Share on other sites More sharing options...
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