PS fluid
Mountain Pass
Joined: Mar 2021
Posts: 149
Likes: 77
405k Ex 7.3 4x4 1 owner since new.
I evacuated my power steering fluid many years ago as my PS pump was making bad noises.
Refilled using Mobil 1 ATF.
Once in a while I do siphon out the reservoir and top off the PS reservoir with new ATF.
Original PS pump still going strong and quite as a church mouse! I have OEM rims and LT285/75/16 tires.
I also use the Mobil1 in my "built trans" 4R100. Great product that has been in my truck for many years.
I evacuated my power steering fluid many years ago as my PS pump was making bad noises.
Refilled using Mobil 1 ATF.
Once in a while I do siphon out the reservoir and top off the PS reservoir with new ATF.
Original PS pump still going strong and quite as a church mouse! I have OEM rims and LT285/75/16 tires.
I also use the Mobil1 in my "built trans" 4R100. Great product that has been in my truck for many years.
Mountain Pass
Joined: Jun 2016
Posts: 214
Likes: 25
I approach this much like transmission oil on newer cars. Drain the pan, fill with new every couple years. Sure, you are never replacing all the oil, but it isn't exposed to combustion level contaminants, so no real reason to. I have a dedicated turkey baster (make sure to clear with wife first, if applicable) for this job. Now, if you are replacing major components in the system, yes, I would flush. Just like if I'm replacing the transmission it just makes sense to then.
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More Turbo
Joined: Aug 2007
Posts: 610
Likes: 20
From: NE Kansas
I approach this much like transmission oil on newer cars. Drain the pan, fill with new every couple years. Sure, you are never replacing all the oil, but it isn't exposed to combustion level contaminants, so no real reason to. I have a dedicated turkey baster (make sure to clear with wife first, if applicable) for this job. Now, if you are replacing major components in the system, yes, I would flush. Just like if I'm replacing the transmission it just makes sense to then.
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More Turbo
Joined: Aug 2007
Posts: 610
Likes: 20
From: NE Kansas
Fleet Mechanic
Joined: Oct 2008
Posts: 1,321
Likes: 250
From: North Texas
Its a 2qt system. Flushing takes minutes and ensures all the air is out of the system. Maybe just me, but I've never perceived this maintenance as time-consuming nor complex. To each their own.
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More Turbo
Joined: Aug 2007
Posts: 610
Likes: 20
From: NE Kansas
If you don't mind share your procedure. thanks.
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Fleet Mechanic
Joined: Oct 2008
Posts: 1,321
Likes: 250
From: North Texas
I follow the above method. I'm on my computer now and see you have a V10 in your signature.
Procedure looks to be a bit different detailed here: https://www.ford-trucks.com/forums/6...intenance.html
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