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View Poll Results: Best fluid for the M5OD-R1HD transmission is...
Mercon V 2 50.00%
Synthetic Mercon V 2 50.00%
Synthetic parts store ATF 0 0%
Synthetic manual transmission fluid 0 0%
Voters: 4. You may not vote on this poll

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Old 02-12-2019, 06:07 PM   #21
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Bottles look old to me, I would pass. Especially at $18/qt.
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Old 02-12-2019, 06:14 PM   #22
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Quote:
Originally Posted by Mike Tonon View Post
So I just came across this Synthetic Mercon by Motorcraft.

https://www.ebay.com/itm/NEW-Motorcr...d59a%7Ciid%3A1

I wonder if itís been sitting on a shelf for 10 years. Is this the synthetic version of regular Mercon?
Unless you can find something on it saying it meets Mercon V spec, I would walk.
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Old 02-18-2019, 03:36 PM   #23
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A friend of mine had put Mercon V into his '93 M5OD many years ago... Within a week he was having issues with shifting (hard to get it into gear while stopped, and chunky or notchy shifts while driving) (this was NOT a clutch issue, he actually still has the same clutch in it today). I've also seen others report similar issues shortly after Ford was flip-flopping back & forth about whether Mercon V was backward compatible with Mercon or not before finally deciding on that it was.

There are also some people who have used Merc V and not reported an issue, however I personally wouldn't chance it on any M5OD manufactured before 2008 (the first year Ford began the recommendation of Merc V for the M5OD). Seems there is a reason Mercon remains on the market as "Dex/Merc", which is what I'd use in any case (that or a synthetic MTF like Royal Purple Synchromax).

My belief is that there is an additive in Mercon V (not present in Mercon) that is too slippery to allow the transmission synchros to function properly.
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Old 02-19-2019, 05:22 PM   #24
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Ok, I found out I had a quart of parts store brand Mercon left over from a job years ago and I also bought a couple quarts of Royal Purple ATF. I’m going to throw those in. I gotta try the RP, I’m curious what it will be like with that. Thanks everyone!
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Old 02-19-2019, 09:30 PM   #25
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Whoa! You cant mix straight mercon and royal purple!!!!!
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Old Yesterday, 07:26 AM   #26
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Whoa! You cant mix straight mercon and royal purple!!!!!
It says compatible.

And if itís true what some have said about using synthetic being too slippery, I guess I should do about 30% regular atf. Best if both worlds.
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Old Yesterday, 07:42 AM   #27
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Quote:
Originally Posted by Mike Tonon View Post
It says compatible.

And if it’s true what some have said about using synthetic being too slippery, I guess I should do about 30% regular atf. Best if both worlds.
You need at least 20% type F with mercon in order to use 70% synthetic multi formula. And I would still use 50% lucas.
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Old Yesterday, 09:12 AM   #28
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You need at least 20% type F with mercon in order to use 70% synthetic multi formula. And I would still use 50% lucas.
Type F?... F U 😆
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Old Yesterday, 10:37 AM   #29
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I'm running 1 quart of Royal Purple Synchromax and 2 quarts of store brand Dex/Merc. It works great.
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