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Old 03-26-2019, 11:29 AM   #1
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Changing PS fluid with Mobile 1 15/50 today

I'll be changing original mtx-75 tranny fluid with a 5 qt jug of Mobile 1 15/50 so I figure I'll do the PS fluid with some of the leftovers. Current PS fluid is about 20 years old now, slightly below min line and looks pretty nasty.

From what I read I think it'll be ok, but if anyone reading thinks I'm making a mistake please feel free to let me know.

Oh, as a side note, I checked my brake fluid the other day and it was bone dry (the reservoir has an inner dark stain which tricked me into thinking it was fluid), but the ol' focus was operating fine. No fluid loss since I topped it off. It sat for a long time and rarely driven for years so I suspect the fluid loss was the result of an accident around 10 years ago where the damage from running into a median wall on NJ turnpike was confined to the driver's side front wheel assembly.


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Old 03-26-2019, 11:49 AM   #2
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Do not put motor oil in your power steering fluid.

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Old 03-26-2019, 11:59 AM   #3
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Quote:
Originally Posted by dhath81 View Post
I'll be changing original mtx-75 tranny fluid with a 5 qt jug of Mobile 1 15/50.
Are you sure that's an acceptable substitute for this?

"Motorcraft Full Synthetic Manual Transmission Fluid is a premium-quality SAE 75W-90 gear oil."
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Old 03-26-2019, 01:32 PM   #4
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Exclamation

not sure if trolling....

clearing some things up

engine/gear oil are lubricants

Power steering fluid is a mineral oil or silicone based hydraulic oil very similar or even identical to automatic transmission fluid

Brake fluid is not oil based and is totally incompatible with mineral oil. In fact mineral oil will quickly destroy the rubber seals in a brake system. Brake fluid will strip paint from your car very quickly!

so, use the right material for the right application

use gear oil for manual tranny, hydraulic for auto not engine oil -- you only change it once every 120k miles, do it right the first time or you will be looking for a new car or tranny
use engine oil for engine not gear oil
use PS fluid for PS, or ATF if in a pinch not gear/engine oil
use brake fluid for brakes not anything else, no substitutes!!!

Last edited by Smalls89; 03-26-2019 at 01:35 PM.
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Old 03-26-2019, 03:14 PM   #5
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https://www.focusfanatics.com/forum/...t-fluid-3.html

Quote:
Originally Posted by 1turbofocus View Post
I use synthetic Mobile engine 50wt oil in My MTX-75 and SVT Getrag and have in over 200 other Foci with no issue at all , If it holds up to 300+ HP to the wheels for 14 years should be fine to keep using

Tom


I wasn't sure about using it for PS fluid. I guess it's too thick. For the tranny fluid, there seems to be quite a bit of support for Mobil 1 15w-50's use for this application, assuming I understood correctly, is there some other 15w-50 they were referring to?
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Old 03-26-2019, 03:23 PM   #6
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Ford recommends automatic transmission fluid in the power steering system.

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Old 03-26-2019, 03:51 PM   #7
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The owner's manual for my vehicle calls for Mercon ATF for transmission and it calls for the same type of fluid for power steering. They later updated this to (article from '07)

"Effective July 1, the production and licensing for MERCON will cease. Automatic transmissions, power steering systems and manual transmissions previously requiring MERCON must, as of July 1, be serviced with MERCON V."

"“All transmissions which recommended using MERCON ATF can now be serviced with MERCON V,” said Ron Romano, FCSD Service Lubricants Technical Expert. “MERCON V is a tighter specification which delivers better anti-oxidation, anti-wear and anti-shudder properties. It also provides increased protection against deposits, rust and corrosion. All of this helps ensure customers receive a better fluid,” said Romano."

Again same type of fluid. That's why I assumed it might be ok. Aside from that, I noticed some claims from other people (don't think on this forum) that were using 15w-50 for their power steering. At any rate, I'm perfectly fine with putting in what Ford recommends for PS.

Now the recommended fluid for the mtx-75 is supposed to be XT-M5-QS from what I understand, but other people have been using other fluids and Mobil 1 15w-50 is far easier to obtain than the special Ford honey.

And yes I did use dot 3 brake fluid to top that off, I didn't put engine oil in that. I was not trolling. I was researching and asking questions.
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Old 03-26-2019, 04:33 PM   #8
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Quote:
Originally Posted by dhath81 View Post
Now the recommended fluid for the mtx-75 is supposed to be XT-M5-QS from what I understand, but other people have been using other fluids and Mobil 1 15w-50 is far easier to obtain than the special Ford honey.
Your car...your call, but I'd put the correct stuff in my trans. Not hard to obtain. Amazon has it now and your dealer probably does as well.
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Old 03-26-2019, 05:06 PM   #9
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RockAuto also has it.


https://www.rockauto.com/en/parts/mo...on+fluid,13630

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Old 03-27-2019, 01:32 AM   #10
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Manual transmissions can use either automatic trans fluid or thicker gear oils, they dropped to go to the thinner trans fluids to save gas mileage. Use what you want there but the shifting qualities stay much better using the lighter fluid. ATX fluid is around 10 weight for what it's worth.

Do NOT use thick oil in the PS system, it works based on the viscosity and you have messed up using thicker oil there. Anybody the OP ran across doing that is quite frankly an idiot. It is automatic trans fluid that can be used in PS, as PS fluid is simply trans fluid minus some additives and the dye.
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