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2008 F250 Manual Transmission Fluid

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Old 07-01-2014, 08:21 PM
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2008 F250 Manual Transmission Fluid

I'm looking for Manual Transmission fluid for my 2008 F250 Super Duty V10 6speed manual trans 2WD. My owners manual calls for XT-M5-QM. I can't seem to find any for sale online but I can find XT-M5-QS. Will this work? Or, do you know of another fluid that would work? Thanks.
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Old 07-01-2014, 10:20 PM
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I'm about to begin the search for this, too... I think you can get it from Official Ford Parts Site | Buy Motorcraft & OEM Ford Parts Online | FordParts.com or your local dealer. No stores carry it as 2008 was the only year it was used, and there was enough of a complaint about hard shifting in the cold that they created a TSB to tell dealers to remedy the problem by using automatic transmission fluid.

The same ATF specified for 2007 and 2009 will work (as the transmissions are identical). Personally, I don't mind the double-clutch on frigid mornings as the MTF is a bit more viscous.
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Old 07-02-2014, 02:19 PM
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That's interesting about the ATF switch. I had an occasional difficult shift over the years but nothing too bad, I thought I was just getting weak!

Is there any reason we should not switch to ATF in our 08's?
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Old 07-02-2014, 03:20 PM
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And to make things even more confusing, if we were to switch to ATF, which one? 2007 Owner's Manual specifies MERCON ATF (not SP), and 2009 Owner's Manual specifies MERCON V ATF.
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Old 07-02-2014, 06:43 PM
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According to FordParts: Motorcraft® Transmission Fluids

Mercon V can be used where Mercon is specified, so I'd say the V is fine.

On that same page, you can see that the MTF is an SAE 75w-90 full synthetic.
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Old 07-03-2014, 09:35 PM
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My '09 6 speed does not use ATF.
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Old 07-03-2014, 10:11 PM
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Quote:
Originally Posted by bucci View Post
My '09 6 speed does not use ATF.
What does it use?
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Old 07-04-2014, 12:24 PM
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Manual transmission fluid (gear oil).
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Old 07-07-2014, 05:54 PM
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Thanks to all for the input. I'm staying with the Ford Full Synthetic Manual Transmission Fluid for my '08. This document also helped:

http://www.carquestprofessionals.com...0%206.6.13.pdf

This document answers one of my questions by saying that the current XT-M5-QS is correct for my 08 (even though my owner's manual calls for XT-M5-QM). It also says 'Available from Dealer' which I take to mean there is no suitable aftermarket MTF.

bucci:
This document and the owner's manual I found online both say the 09 6sp with Gas engine uses the Mercon V, where the 09 6sp behind the diesel uses the Manual Transmission Fluid.
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Old 07-09-2014, 06:33 PM
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My owner's manual says to use manual transmission fluid. 9/08 build date.
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