Rear FX4 Differential Fluid

[Kenny]

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[Montana]

What would you send them? A tiny vial of your $50 quart of Ford RDU fluid?

Yep. $30 though.

 

[Kenny]

Yep. $30 though.

For the good of humanity, or at least the Maverick community. Thank you. How much is Blackstone's fee? And where did you get a quart of Ford 75W fluid for $30? One quart of the Mobil 1 was nearly $20.

 

[Montana]

For the good of humanity, or at least Maverick owners. Thank you. How much is Blackstone's fee? And where did you get a quart of Ford 75W fluid for $30? One quart of the Mobil 1 was nearly $20.

Rock Auto for the fluid:

75W RDU fluid

And my link to some part numbers:

My part number list

The response from Blackstone I got is pretty much expected. No clarification and I'll send them a sample to see what specific viscosity and additives are used.

Literally all we want to know is the exact viscosity so we can shop elsewhere lol. It's crazy that FORD is even getting away with this. It seems very monopoly like to vaguely label a fluid this way. So I'll get it done and hopefully we get some clarification.

I'm not sure the cost for this one. I bought a bulk sample set years ago but I believe it's somewhere around $30-40 for an oil analysis.

 

[Kenny]

The response from Blackstone I got is pretty much expected. No clarification and I'll send them a sample to see what specific viscosity and additives are used....

[BLACKSTONE RESPONSE]

Literally all we want to know is the exact viscosity so we can shop elsewhere lol. It's crazy that FORD is even getting away with this. It seems very monopoly like to vaguely label a fluid this way. So I'll get it done and hopefully we get some clarification.

Wow, thanks for your efforts. That's pretty much how I felt about it. Nothing magically different about the Ford RDU and all the other diffs I've serviced over the past 50 years. A high quality synthetic gear oil with FMs should be fine. I am saving this response for future reference, in case Ford wants to tell me I should have used their overpriced monkey piss. And I feel fine using 75W90.

I run into the attitude all the time from dirtbike forums to pickups to cars, people who are afraid if they don't use the dealer recommended oil they'll void their warranty, regardless of how good the oil is. Example: it's a well-known fact that KTM has a contract with Motorex which is why they recommend it in all their bikes. There are many oils as good or better than Motorex, but chicken dirt bikers will pay double or triple to only use Motorex. Truth be told, that contract is very likely the result of KTM soliciting bids to supply oil for all their new bikes, and Motorex was the lowest bidder. The reality is a good oil that meets the minimum requirements, changing at recommended service intervals, your engine/transmission/whatever is going to outlive the warranty so it's a non-issue, PLUS the dealer is under a legal obligation to honor that warranty.

Thanks again.

 

[Montana]

Wow, thanks for your efforts. That's pretty much how I felt about it. Nothing magically different about the Ford RDU and all the other diffs I've serviced over the past 50 years. A high quality synthetic gear oil with FMs should be fine. I am saving this response for future reference, in case Ford wants to tell me I should have used their overpriced monkey piss. And I feel fine using 75W90.

I run into the attitude all the time from dirtbike forums to pickups to cars, people who are afraid if they don't use the dealer recommended oil they'll void their warranty, regardless of how good the oil is. Example: it's a well-known fact that KTM has a contract with Motorex which is why they recommend it in all their bikes. There are many oils as good or better than Motorex, but chicken dirt bikers will pay double or triple to only use Motorex. Truth be told, that contract is very likely the result of KTM soliciting bids to supply oil for all their new bikes, and Motorex was the lowest bidder. The reality is a good oil that meets the minimum requirements, changing at recommended service intervals, your engine/transmission/whatever is going to outlive the warranty so it's a non-issue, PLUS the dealer is under a legal obligation to honor that warranty.

Thanks again.

Yea I just want to wait to see specifics so I know whether it's 85w or 140 or what. Given the fickle nature of the PTU and it's placement, as well as living in a colder climate. it's not something I care to guess on. Too thick and I'll have a putty inside my dif all winter.

 

[Kenny]

Yea I just want to wait to see specifics so I know whether it's 85w or 140 or what. Given the fickle nature of the PTU and it's placement, as well as living in a colder climate. it's not something I care to guess on. Too thick and I'll have a putty inside my dif all winter.

I don't get it. Isn't it 75W, since that's what's on the label?

I've driven many cars and pickups over the past 50 years, and if I ever checked the transmission or differential, they were normally half full of black crud, often leaking, yet somehow never had an issue. Here I am 40+ years later worrying about using the proper oil, which I'll change every 30k miles like clockwork. But I paid $29k for this truck compared to many past vehicles that were probaby worth on average $1500.

 

[Big Kahuna]

Replaced mine at 65,000 - fluid looked quite good.

 

[craigt502]

25k miles. Drain and refill took about 600ml.

 

[dalola]

I've done mine twice now in 42K miles, the second time was noticeably cleaner. I'll probably do the third at around 70-80K.

 

[thejdfisher]

I don't see anywhere in any thread how much does each diff take. Does anyone know how many ounces each diff takes?

 

[mavhopefull]

I don't see anywhere in any thread how much does each diff take. Does anyone know how many ounces each diff takes?

I don’t have the exact specs on hand, but you just need to fill it until the fluid starts to slightly overflow from the fill hole.

 

[thejdfisher]

Is it less then a quart for each or do I need to buy more then one quart for each?

 

[Tbone289]

Is it less then a quart for each or do I need to buy more then one quart for each?

It's less than a quart for each.

 

[mavhopefull]

It's less than a quart for each.

Here's what I found


For your 2022 Ford Maverick FX4, here's the information regarding your differentials:

Rear Disconnect Differential (Rear Drive Unit - RDU)

• Type: The FX4 package on the 2022 Maverick, when paired with the EcoBoost engine and AWD, generally has a standard rear drive unit, not the twin-clutch differential lock found on the Tremor package. Some sources suggest it's a "disconnect rear drive unit with a low offset hypoid gear."
• Oil Capacity: Approximately 1.6 pints (or 0.8 quarts). Some sources have also mentioned around 0.5 quarts or 2 pints, so it's a good idea to confirm by filling until the fluid level is about 2mm below the filler hole.
• Specifications: Ford recommends Motorcraft® SAE 75W Disconnect Rear Drive Unit Fluid (part number XY-75W-QL). This is a synthetic fluid specifically formulated for Ford disconnect rear drive units. It's designed for lower viscosity to improve efficiency and fuel economy, and includes friction modifiers, antiwear, and extreme pressure additives.
  

Front Differential (Power Transfer Unit - PTU)

• Type: Power Transfer Unit (PTU).
• Oil Capacity: Approximately 0.5 quarts. Some reports indicate that many PTUs were underfilled from the factory, so it's a good idea to check and top off if necessary.
• Specifications: Ford recommends Motorcraft® SAE 75W-85 Premium Synthetic Hypoid Gear Lubricant (part number XY-75W85-QL), which meets Ford specification WSS-M2C942-A. Some owners have also used full synthetic 75W-90 or 80W-90 GL-5 gear oil.

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