I had the tranny serviced on my E99, asked for Dex/Merc, got Merc 5, Now what? - Ford Powerstroke Diesel Forum
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Old 07-21-2014, 05:13 PM
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I had the tranny serviced on my E99, asked for Dex/Merc, got Merc 5, Now what?

I just picked my truck up from the local tranny shop. I asked for dex merc, they put in Merc 5. Is this going to hurt the tranny? Is there a spec somewhere I can show them that says Dex Merc for the 99 year model?

I swear every tranny shop in my hometown is a joke.
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Old 07-21-2014, 05:31 PM
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I should have noted that I picked the truck up after hours and paid over the phone earlier. I didn't notice that they charged me for 10qts of Merc 5 until I got home and reviewed the bill. This just pisses me off.
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Old 07-22-2014, 02:55 AM
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Call them and thank them for the upgrade. Mercon V is a recommended replacement by Ford motor company

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Old 07-22-2014, 08:59 AM
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Originally Posted by POWER-STRUCK View Post
Call them and thank them for the upgrade. Mercon V is a recommended replacement by Ford motor company

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I have always been told to run dex-merc3?
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Old 07-22-2014, 08:39 PM
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http://www.fordparts.com/Products/Ch...ionFluids.aspx

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Old 07-22-2014, 09:36 PM
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mercon v is synthetic and contains friction modifiers. torque converter and coast clutch operation is improved and synthetic fluid can handle a lot more heat before burning up.

any synthetic oil has a tendancy to find spots where it can leak out easier than dino oil. you might end up with a leak, you might not. if you do end up with a leak somewhere, it was going to leak sometime anyway with regular oil.

my advice is to forget about it and move on.
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Old 07-23-2014, 01:13 AM
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Thanks everyone, I will leave it in. I guess at some point since I was more involved with Ford vehicles they changed the formulation of Merc5 so it would be fine in the dex3/merc trannys.
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Old 07-23-2014, 05:43 AM
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Repost from your other thread;


Here's what we know....

Your Owners Manual specifically says "DO NOT PUT MERCON 5 IN YOUR TRANSMISSION"

FORD says "No, No, forget that. Go ahead and use it."

The formula for Merc 5 remains unchanged.

Up to you, I don't put it in my trans, but I'm really not sure what it will do, just don't want to take the chance....

In the end, with these two contradictory stands, you have to wonder about the motivation for Fords change. It only benefited THEM for logistic reasons and since by the time they made it they had No responsibility for any of the transmissions that had Merc 5 put in them - what did they have to lose?

If you have ever had your transmission rebuilt, with new seals, I don't think it's an issue at all - Merc 5 is OK to use. Otherwise, I'm not sure and again, unwilling to gamble
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Old 07-23-2014, 05:54 AM
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Interesting read. My tranny is up for service next week. My truck is an '02 what fluid should I look for them to use?
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Old 07-23-2014, 06:03 AM
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Originally Posted by Bowhntr View Post
Interesting read. My tranny is up for service next week. My truck is an '02 what fluid should I look for them to use?
Its based on personal preference apparently.

I would say if you can drain the converter upgrade to mercV. If you can't drain the converter (meaning its been changed) stick to mercV because that's what is more than likely in it.


Sent from AutoGuide.com App
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