Davidoo Posted March 22 Report Share Posted March 22 I have a 22ST nearing 30,000 miles. I've seen several different posts in the past about changing these fluids, but are a bit confusing to me. Are there 3 different parts that need the fluid changed. I've seen PTU, rear differential, but I assume there is also a regular transmission that needs it too? I know some have changed their own, but I don't really have a way to lift the vehicle level and just don't feel like doing it myself. Will probably go to the dealer as I have a bunch of Fordpass points. What am I looking at as far as cost, and should all 3 be changed around 30k miles? Thanks! 1 Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 22 Report Share Posted March 22 From what I know is you definitely want the PTU and RDU fluid changed. I would make sure that the dealership actually knows what you are trying to get serviced. Seems like some of them are in the dark on the PTU fluid change as it is not listed as a routine service. I think the transmission could be at a later time interval but not sure. I too would like more info on this as I will be taking mine to the dealer when the time comes for me. 2 Quote Link to comment Share on other sites More sharing options...
garycrist Posted March 22 Report Share Posted March 22 @Davidoo, I also have a 22 ST too. As you stated confusion exists but I will help you. Our RDUs have a drain plug and a fill plug and the tranny has a drain and fill plug too. AS for no lift, I used 4 ramps https://www.amazon.com/RhinoGear-11912-RhinoRamps-Vehicle-Ramps/dp/B0117EESNC/ref=sr_1_4?crid=R9MRLD01WYW4&dib=eyJ2IjoiMSJ9.4okd22uK9UE4fyiUUj08Slo6FXaiQHl7CDfDtOe6sUfcGRBJAgsX8MqPngrm9kJj4_3k1CFA6Tj8lj_S6e8kSUuSTfKfL3gifNAavPsy5QjQ8d7glVtjxGhLRXcCP5xovssfsIUDvyJ4RNRBKRRV7a7v0DqBTpW18rGk--538kcq-1PGrilqWVhHZfyIYVigRFrCLV_D8o756fLxqh10yHiJWildoqkhEio7Lu-oe1u3RCq-jffBN70GoWrpAU-YpLRZ3mWX2xMWnG01UCtJdanexSTKHq_awTxbnnfHug7tSZt43yLO8t8X8Ox5CDqcKOvO3NIVLqVk2cWpT9jm35ooQ3sB5zbEurysBH27zblI8fy18LW8xriFy3MuRQUnoUYKv5_n5Y_OVCdb9bA4TuXlUaXChZ9w9mkW_Dcj7k6KTmg84ncSQ3S2RLWiyFHr.ey3DhlG06_05QhLU4ioQXHO0ZfYSV2WxTZ0qQ3m43Lg&dib_tag=se&keywords=drive%2Bup%2Bramps&qid=1742655930&sprefix=drive%2Bup%2Bramps%2Caps%2C155&sr=8-4&th=1 to do all my service on a creeper to boot! 3 Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 22 Report Share Posted March 22 garycrist. do you have a recommendation on what fluids to use in the PTU and RDU? I know they each use a different fluid and there are some good choices including the OEM. I have heard about Redline shockproof for the PTU and not sure about the RDU. Thanks for any feedback. 1 Quote Link to comment Share on other sites More sharing options...
Davidoo Posted March 22 Author Report Share Posted March 22 6 hours ago, garycrist said: @Davidoo, I also have a 22 ST too. As you stated confusion exists but I will help you. Our RDUs have a drain plug and a fill plug and the tranny has a drain and fill plug too. AS for no lift, I used 4 ramps https://www.amazon.com/RhinoGear-11912-RhinoRamps-Vehicle-Ramps/dp/B0117EESNC/ref=sr_1_4?crid=R9MRLD01WYW4&dib=eyJ2IjoiMSJ9.4okd22uK9UE4fyiUUj08Slo6FXaiQHl7CDfDtOe6sUfcGRBJAgsX8MqPngrm9kJj4_3k1CFA6Tj8lj_S6e8kSUuSTfKfL3gifNAavPsy5QjQ8d7glVtjxGhLRXcCP5xovssfsIUDvyJ4RNRBKRRV7a7v0DqBTpW18rGk--538kcq-1PGrilqWVhHZfyIYVigRFrCLV_D8o756fLxqh10yHiJWildoqkhEio7Lu-oe1u3RCq-jffBN70GoWrpAU-YpLRZ3mWX2xMWnG01UCtJdanexSTKHq_awTxbnnfHug7tSZt43yLO8t8X8Ox5CDqcKOvO3NIVLqVk2cWpT9jm35ooQ3sB5zbEurysBH27zblI8fy18LW8xriFy3MuRQUnoUYKv5_n5Y_OVCdb9bA4TuXlUaXChZ9w9mkW_Dcj7k6KTmg84ncSQ3S2RLWiyFHr.ey3DhlG06_05QhLU4ioQXHO0ZfYSV2WxTZ0qQ3m43Lg&dib_tag=se&keywords=drive%2Bup%2Bramps&qid=1742655930&sprefix=drive%2Bup%2Bramps%2Caps%2C155&sr=8-4&th=1 to do all my service on a creeper to boot! Thanks Gary, I thought about 4 ramps and those look nice. Just not sure as I do have a ton of Ford points, and not feeling like I want to do it. What about the transmission? Is that not a concern as much as the PTU and RDU? 1 Quote Link to comment Share on other sites More sharing options...
chr8990 Posted March 23 Report Share Posted March 23 (edited) For what it’s worth, I have a 2022 Edge ST and the documentation the Ford techs use when servicing the PTU and RDU. Inside of it, you will see all of the parts required as well as the OEM fluids. It could be a little dependent on year and perhaps even packages selected on the build (400a vs 401a) but mine has a cooler attached to the PTU. 2022 Edge ST Rear Differential Fluid Change.pdf 2022 Edge ST PTU Fluid Change.pdf Edited March 23 by chr8990 2 Quote Link to comment Share on other sites More sharing options...
chr8990 Posted March 23 Report Share Posted March 23 (edited) I did go ahead and flush the transmission fluid on mine at 30K, as that also services the front differential, but probably not as big of a concern as the PTU. I always do the transmission fluid every 30K on all of my vehicles I actually care about though. Edited March 23 by chr8990 1 Quote Link to comment Share on other sites More sharing options...
Davidoo Posted March 23 Author Report Share Posted March 23 So there are 3 separate drivetrain fluids......transmission, PTU, and RDU? Just want to verify that to see what I want to get changed. 2 1 Quote Link to comment Share on other sites More sharing options...
chr8990 Posted March 23 Report Share Posted March 23 33 minutes ago, Davidoo said: So there are 3 separate drivetrain fluids......transmission, PTU, and RDU? Just want to verify that to see what I want to get changed. Correct 2 Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 25 Report Share Posted March 25 Thank you chr8990 for the pdf on the ptu/rdu. I believe the ST's use a high torque ptu ? Other than a cooler there must be some stronger internal components. 1 Quote Link to comment Share on other sites More sharing options...
chr8990 Posted March 26 Report Share Posted March 26 4 hours ago, STBEAST said: Thank you chr8990 for the pdf on the ptu/rdu. I believe the ST's use a high torque ptu ? Other than a cooler there must be some stronger internal components. I’m not sure there’s actually any real difference between the PTU that the 2.0L trims have and the 2.7L. Maybe there is and I haven’t seen it but they seem to share the same part numbers on the assemblies. Here is one without the hot weather group (without cooler): https://ford.oempartsonline.com/oem-parts/ford-transfer-case-k2gz7251m Here is one with the hot weather group (with cooler): https://ford.oempartsonline.com/oem-parts/ford-transfer-case-k2gz7251e As you may notice, both of these fit the 2.0L and 2.7L. There are differences in the differentials though. 2.0 Diff: https://ford.oempartsonline.com/oem-parts/ford-differential-assembly-k2gz4000u?c=Zz1zdXNwZW5zaW9uJnM9YXhsZS1hbmQtZGlmZmVyZW50aWFsJmw9MSZuPVNlYXJjaCBSZXN1bHRzJmE9Zm9yZCZvPWVkZ2UmeT0yMDIyJnQ9dGl0YW5pdW0mZT0yLTBsLWw0LWdhcw%3D%3D 2.7 Diff: https://ford.oempartsonline.com/oem-parts/ford-differential-assembly-k2gz4000r?c=Zz1zdXNwZW5zaW9uJnM9YXhsZS1hbmQtZGlmZmVyZW50aWFsJmw9MSZuPVNlYXJjaCBSZXN1bHRzJmE9Zm9yZCZvPWVkZ2UmeT0yMDIyJnQ9c3QmZT0yLTdsLXY2LWdhcw%3D%3D Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 26 Report Share Posted March 26 (edited) This is from Ford: It applies to the 2022-2024 ST There are two different models of the PTU. The low torque PTU is paired with the 8F35, 8F40, and MMT6 transmissions. The high torque PTU is paired with the 8F57 transmission. The low torque and high torque PTUs are similar in design and operation. The ST has the 8F57 transmission Edited March 26 by STBEAST Quote Link to comment Share on other sites More sharing options...
chr8990 Posted March 26 Report Share Posted March 26 1 hour ago, STBEAST said: This is from Ford: It applies to the 2022-2024 ST There are two different models of the PTU. The low torque PTU is paired with the 8F35, 8F40, and MMT6 transmissions. The high torque PTU is paired with the 8F57 transmission. The low torque and high torque PTUs are similar in design and operation. The ST has the 8F57 transmission That sounds like it’s from the Workshop Manual or something. I don’t own that but, if so, that does make logical sense. It’s still curious to me that the parts website seems to list the same part for the 2.0 and 2.7 but it could very well be inaccurate. Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 26 Report Share Posted March 26 Here is some interesting information: A big thank you Haz for this! Power Transfer Unit - Description and Operation - 2.7L EcoBoost - 2022-2024 Edge Workshop Manual.pdf 2 Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted March 30 Report Share Posted March 30 On 3/21/2025 at 10:10 PM, Davidoo said: Will probably go to the dealer as I have a bunch of Fordpass points. What am I looking at as far as cost, and should all 3 be changed around 30k miles? I use the dealer as well. What I use for a schedule is: • Oil (at 7.5k) • Power steering (40k) • Brake (30 - 60 k depending on environment) • Transmission (60 k) • PTU (30k) • Coolant (30k) • RDU (90k or after anytime car driven through deep water) • Can of fuel injection & system cleaner (1-2× year) In addition, don't forget to check: the air cleaner (30k), the cabin filter (every 6 mos), seat filters (if you have heated/cooled seats) (annually), fuel filter (150k) and air pressure in spare tire (every 6 mos). Quote Link to comment Share on other sites More sharing options...
STBEAST Posted April 1 Report Share Posted April 1 Seems like going 7.5k on oil changes is pushing it. I do mine at 4-4500. I am using OEM semi synthetic as recommended by the dealer. The dealer did say using full synthetic would allow me to go longer on the interval. I think the turbochargers are dependent on good clean oil. Just my thoughts. 1 2 Quote Link to comment Share on other sites More sharing options...
chr8990 Posted April 1 Report Share Posted April 1 This is my maintenance schedule: • Oil - Full Synthetic (5k) • Brake Fluid (40K) • Transmission Flush (30K) • Coolant Flush (45K) • Spark Plug replacement/Tune Up (45K) • PTU (30K) • RDU (30K - same time as PTU) • I have a catch can on mine: https://www.jlosc.com/jl-3-0-oil-separator-passenger-side-2015-2020-edge-sport-st-lincoln-mkx-2-7l-ecoboost/ • I'll still have the dealer do a The Works Plus Package that includes a treatment of BG 44K once every 3 oil changes 2 Quote Link to comment Share on other sites More sharing options...
1004ron Posted April 1 Report Share Posted April 1 @chr8990 My schedule is much the same. • Oil - Full Synthetic (5k) - same • Brake Fluid (40K) - 2 years • Transmission Flush (30K) - 45K • Coolant Flush (45K) - 2 to 3 years • Spark Plug replacement/Tune Up (45K) - same • PTU (30K) - same • RDU (30K - same time as PTU) - same • I have a catch can on mine - I have the same JLT catch can 2 Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted April 1 Report Share Posted April 1 3 hours ago, STBEAST said: Seems like going 7.5k on oil changes is pushing it. I do mine at 4-4500. I am using OEM semi synthetic as recommended by the dealer. The dealer did say using full synthetic would allow me to go longer on the interval. I think the turbochargers are dependent on good clean oil. Just my thoughts. I have an aspirated 3.5. 7.5k is the recommended interval, although I usually add a quart around 6k miles. 1 Quote Link to comment Share on other sites More sharing options...
Samurai Edge Posted Wednesday at 06:57 PM Report Share Posted Wednesday at 06:57 PM On 3/30/2025 at 6:05 PM, enigma-2 said: I use the dealer as well. What I use for a schedule is: • Oil (at 7.5k) • Power steering (40k) • Brake (30 - 60 k depending on environment) • Transmission (60 k) • PTU (30k) • Coolant (30k) • RDU (90k or after anytime car driven through deep water) • Can of fuel injection & system cleaner (1-2× year) In addition, don't forget to check: the air cleaner (30k), the cabin filter (every 6 mos), seat filters (if you have heated/cooled seats) (annually), fuel filter (150k) and air pressure in spare tire (every 6 mos). The STs have electronic steering so there is no PS fluid. My Dealer recommends the RDU at 30K miles, the PTU they reluctantly say 30K miles and the transmission they say 5 years or 30K miles, which ever comes first. Per manuals, I find brake fluid at 3 years ( no mileage ). Coolant, depending on your source could be anywhere up to 100K miles. However, I typically use the Severe Duty schedule when looking at maintenance service schedules, so those values are typically much shorter than the standard maintenance schedules STBEAST - You don't want to use Redline Shockproof ( either variety ) in either your PTU or RDU. Way too heavy. The PTU calls for 75W85 and the RDU calls for 75W for disconnect RDUs. Apparently only Ford has the 75W fluid available, which can be pricey but it appears it is a special formula specifically for the Disconnect RDU. The Disconnect RDU engages or disengages depending on vehicle engine load. If it were me\, I would only use the 75W 1 Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted Wednesday at 07:55 PM Report Share Posted Wednesday at 07:55 PM 53 minutes ago, Samurai Edge said: STBEAST - You don't want to use Redline Shockproof ( either variety ) in either your PTU or RDU. Way too heavy. The PTU calls for 75W85 and the RDU calls for 75W for disconnect RDUs. Apparently only Ford has the 75W fluid available, which can be pricey but it appears it is a special formula specifically for the Disconnect RDU. The Disconnect RDU engages or disengages depending on vehicle engine load. If it were me\, I would only use the 75W Couldn't agree more. Ford's PTU fluid is probably the best for the unit. Anything less may turn thick under so much heat. I did some research a few years ago and believe that Ford is using US Lubricants, 300 Waylube. This lubricant is the best money can buy (which is why Ford charges so much.) Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted Wednesday at 08:00 PM Report Share Posted Wednesday at 08:00 PM 1 hour ago, Samurai Edge said: The STs have electronic steering so there is no PS fluid. Humorous reply ... Where is my electric power steering fluid going? | BobIsTheOilGuy https://share.google/LbSSQkFySXCiwDRle 1 Quote Link to comment Share on other sites More sharing options...
garycrist Posted yesterday at 02:20 AM Report Share Posted yesterday at 02:20 AM Almost like your carburetor is out is out of oil. (MG, Datsun etc. w/ oil dampened slides) Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted yesterday at 02:42 AM Report Share Posted yesterday at 02:42 AM Oh sure, go ahead, laugh .... https://a.co/d/fXTsoGN <snort> Quote Link to comment Share on other sites More sharing options...
garycrist Posted 13 hours ago Report Share Posted 13 hours ago On RDU failure. It looks like the pinion bearings are failing due to fluid break-down due to excessive heat. It is tough to figure out if they do light weight fluids for EPA crap. Bearing clearance on rotating parts has not changed. Clutch pack clearances are the same. Hence, the tighter clearances B.S. that is fed to us, is not a starter nor valid! Before the recent push to maximize fuel economy, lower emissions especially CO2, a heavier weight differential fluid ie. 75-140 etc. was called for for heavy duty service or towing. Remember, Domestic manufactures sell new vehicles. The faster your new pride and joy wears out, the faster the bastards can sell you a new one. r Quote Link to comment Share on other sites More sharing options...
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