Jetboy47

drm1harley: I had less fluid than expected in my RDU as well, the amount you mentioned is close to what I experienced. I also put more fluid in than took out in my PTU. My RDU needed changing at 20k. I feel much better that it is done. I bought the vehicle at 18k. I will probably change both as well as a transmission drain (approx. 5 quarts) every 10k from now on for my own peace of mind.

Yes a seal, but I'm not messing with it without a backup. They say you should replace the bolts too if removed (It's a kit with plug and blots). I'm still under warranty, so no matter what I'm good with pulling half of it every 10k and leave it be. Why they couldn't put a drain plug in it...frigging cost savings.

No, mine does not have a cooler. There is a plug where the cooler would go. I tried finding a spare plug but it's often an unavailable part and it's close to $70 if you can find it. I'm not pulling it without a spare incase there is an issue with it.

Appreciate that boostededge!

I found the same on my ST at 20k for the RDU, it definitely needed changing. I bought my Edge used at 18k. I don't have a drain plug for the PTU so I sucked out half the fluid, like you the PTU fluid wasn't bad yet. I also drained 5 quarts of tranny fluid which looked fine. I'm hoping to keep it for the next ten years so I think I might just do the same every 10k as little as it costs.

Thanks dabangsta!

Yes it's good quality. It's around $70, and there is a coupon code you can use at the top of the website. It has hyperlinks for some things and it's a pdf so you can search. As much as things cost nowadays I think it is a good deal. You will see manual pages quoted to help on this website, they look the same as what I got.

Yes I have from https://www.factory-manuals.com/ It's almost 15k pages in PDF form. I think it's worth it if you are keeping your vehicle for any length of time. You pay them, after that they ask for your vin and then within 24 hours they will send you a link to download it. The link is good for about a month.

I just did my RDU, PTU and a transmission drain and fill the past few days. I just passed the 20k mark on my 2023 ST. The RDU fluid was ok, but honestly it didn't need to go any longer. I put in a few more oz than I took out. The PTU on my vehicle has no drain plug and it is different than all the videos out there that I can find to do a drill and tap. With not being sure where to put a drain plug I pulled/sucked out 350ml and put in 500 ml. Again they shorted me on fluid. The PTU fluid looked good, I was really pleased to see that. I replaced 5 quarts of transmission fluid and it looked in really good shape. I was worried reading all the concerns with the RDU, PTU and transmission. As little as this all cost me in fluids, probably about $120 in total, I think it is worth doing every 20k or less as the RDU fluid definitely needed to be replaced, and only being able to get half the fluid in the PTU. I used the Motorcraft fluids for the RDU and PTU and used Valvoline ULV fluid for the transmission. I bought the Motorcraft fluids on Amazon and the transmission fluid on Rockauto.

I bought a service manual online for my 2023 ST and near the end of the drain and refill procedure it says once the leveling plug is put back in to add 2 pints. I've watched many videos on you tube and have yet to see anyone mention this. Below are steps 17 and 18 from the manual: 17. Install the oil leveling plug. Torque : 30 lb.ft (40 Nm) 18. Add 1L (2 pt) of clean transmission fluid. Material : Motorcraft® MERCON® ULV Automatic Transmission Fluid / XT-12-QULV (WSSM2C949- A, ) Can anyone else confirm that adding the extra two pints is correct. I wonder if they realized they needed to add more than they recommended in the past...

As noted above in the quote, the instructions for the 22ST transmission on step 18 have you adding a liter / 2pt. after the leveling plug is installed back. Is this correct then? Can someone please clarify this.

My 2023 ST appears not to have the cooler either. I'm debating on opening the plug or just suck the fluid out. I bought it at 18k and I'm almost at 20k now. 20250710_080650.heic

Thanks Wubster100, much appreciated. I just ordered the Motorcraft RDU fluid. If anyone has any alternative recommendations for the PTU and Transmission fluids I love to hear.

Can I please get the correct PTU and RDU fluid type for my 2023 ST. I haven't been able to find them in the owners manual. I've seen different varying types on You-tube videos and and I just want to be clear what are the Ford recommended ones for my particular vehicle. I'd like to know the exact fluids and then maybe get the Amsoil equivalent, or another type if anyone believes there is something better than the Ford recommended type for the PTU, RDU, Transmission & engine oil.

Thanks for everyone's help. I bought the FT4Z-581178-C for my 2023 ST. Everything lined up fine like you all have said. I just added two holes for the screw connections on each side of the hitch.