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Old 04-12-2014, 03:26 PM
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wrong fluid?

My fluid got hot enough to blow out the top last summer. Though I had burned it so I had a shop near where I was camping change the filter and drain the tranny (4r100) and refill. I am just about to do it again myself and see the top off quart he gave is mercon v. I thought the replacement for mercon (r) trademark is dextron 3/mercon. It is my understanding the mercon v is a multi use fluid and NOT for our trannies. Before I plan a lawasuit/severe beating can anyone verify this? Ford won't be open till Monday and I would like to drain and swap the filter before then. Thanks
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Old 04-12-2014, 03:56 PM
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My Ford service manual states, CAUTION Using a transmission fluid that indicates a dual usage MERCON(r) and MERCON(r)V, in a transmission application requiring MERCON(r), may cause transmission damage. Use of any other fluid other than the recommended fluid may cause transmission damage. Note: Refer to the dipstick and owners guide for type of transmission fluid required.(Mine says MERCON(r) it continues, Some fluid labels indicate dual usage such as MERCON(r) and MERCON(r)V. These dual usage fluids are not to be used in transmissions that only use the MERCON(r) type fluid. These dual use fluids may be used in transmissions that require MERCON(r)V use. What I get from all this is he used MERCON(r)V in my trannie which requires MERCON(r) Clear as Mud?
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Old 04-12-2014, 03:56 PM
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Here's what I know...

In your owners manual it clearly says "DO NOT MERCON V" and that you should Only use DEXTRON (Mercon) III.

FoMoCo then stops supplying Dex III to their dealerships and says "No, no, no, it's OK now - go ahead and use the Mercon V".

NO CHANGE was ever made to the formula of Merc V

Here's what I think...

The people who designed your transmission knew what they were talking about and Ford now says it's OK for 2 reasons;

1 - it's in their benefit to stock & supply one less drum to all their facilities.

2 - they did this only after they knew it would have no effect on their warranty responsibilities (all the 4R100 were past coverage)

Apparently, the issue is with the rubber seals. If you have a Stock trans, with the Original Seals, I would stay away from Merc V. If you've had yours trans rebuilt, those seals have been changed and are compatible.

BUT, there have been numerous people who have put Merc V in their stock trans, original seals and all, and report no trouble.

Your Choice, You Decide, those are the facts as I know them
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Old 04-13-2014, 03:43 PM
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My filler tube says use mercon with the "r" trademark symbol. simple enough. My confusion is with the fluid this guy put in. It is a Conoco labeled bottle which says mercon V with the "r"trademark as well. With all the other products out there that say "recommended for mercon v" I was after some clarification especially after I was reading up in my shop manuals. I've read a few posts about this and seemed to only make the confusion worse. I'm still wondering if I should stay away from say something like Valvoline for example which has the "recommended for mercon v" on it. I'm going to drain it all regardless, just want to put the correct stuff back in. Thanks for the reply
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Old 04-13-2014, 06:43 PM
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just did a flush on buddys' truck...all mercon V went in, along with the 6.0 cooler
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Old 04-14-2014, 05:32 AM
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"Mercon" is like Fords Brand Name (Dextron is kind of a competitor) so, they're not about to put anything other than the Mercon Name on the dipstick.

BUT, there are different formulas of Dextron, as well as Mercon and they have a Merc III too and a Merc V is Very different (at sometime there must have been a Merc I - II- IV also I assume )

The "r" thing, I think, that you're talking about is that "registered trademark" identifier...
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