Which Trans fluid??
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Any reputable fluid labeled as Mercon V (or "recommended for") is adequate. There are a number of them including the ST you asked about.
Of course, the better question is if the fluid level is low , 1) was the fluid level checked properly and 2) if confirmed to be low, where did the lost fluid go (assuming it was correct at some time)?
Of course, the better question is if the fluid level is low , 1) was the fluid level checked properly and 2) if confirmed to be low, where did the lost fluid go (assuming it was correct at some time)?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
I would only use fluid that says MERCON V on it. I will not use a fluid that says recommended for use where XXX is required. Those are weasel words that mean that the fluid manufacturer states that it is OK with them for you to use their fluid. It does NOT mean that it is good for your transmission.
If it says MERCON V on the label then it has a MERCON V license and Ford has confirmed that the fluid meets the MERCON V specification.
I've used SuperTech MERCON V in my 4R100. IT works fine.
If it says MERCON V on the label then it has a MERCON V license and Ford has confirmed that the fluid meets the MERCON V specification.
I've used SuperTech MERCON V in my 4R100. IT works fine.
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Lead Driver
Joined: Mar 2006
Posts: 6,259
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From: IL
Thank you for the replies. I appreciate them.
@projectSHO89
1) was the fluid level checked properly and
Vehicle fully warmed up on level ground checked in Park while running.
2) if confirmed to be low, where did the lost fluid go (assuming it was correct at some time)?
It's been awhile since I checked it, it's been misfiring for awhile so I let it sit until I could get to it. Had to put a new oil tube for the dip stick in it, it rusted off. Then I had to change all the coils plugs and MAF, even though no readers would pull codes. Checking the Trans, the fluid is on the ball of the stick, so it's been at least 6 months since checking it and it was full last time. I was under the truck over the weekend and did not notice and leakage, but not to say one didn't develop...I did not check into the cooler lines at the front though. I'm going to pick up about 4 quarts on the way home, I don't think it will take more than 2. I'll check for leaks again after I warn it up and fill it up.
@projectSHO89
1) was the fluid level checked properly and
Vehicle fully warmed up on level ground checked in Park while running.
2) if confirmed to be low, where did the lost fluid go (assuming it was correct at some time)?
It's been awhile since I checked it, it's been misfiring for awhile so I let it sit until I could get to it. Had to put a new oil tube for the dip stick in it, it rusted off. Then I had to change all the coils plugs and MAF, even though no readers would pull codes. Checking the Trans, the fluid is on the ball of the stick, so it's been at least 6 months since checking it and it was full last time. I was under the truck over the weekend and did not notice and leakage, but not to say one didn't develop...I did not check into the cooler lines at the front though. I'm going to pick up about 4 quarts on the way home, I don't think it will take more than 2. I'll check for leaks again after I warn it up and fill it up.
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Lead Driver
Joined: Mar 2006
Posts: 6,259
Likes: 438
From: IL
I was looking for the motorcraft brand but nobody in my area is carrying it except Ford. I saw Super Tech mercon v at Walmart then I figured I'd use the Mobil brand but they only had it for import cars so I grabbed the last 2 quarts of Super Tech. I know Mark is the expert that's why I was looking for the Mobile trans fluid after reading about the race he was using it on the 4R100 trans with the oil coolers and fans setup in the bed of the truck...lol innovative for sure.
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From: Southern OH
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
NOBODY has made a MERCON rated fluid since the specification was obsoleted in 2006. Now all anyone can make is a fluid that they recommend for use where MERCON was specified. It does NOT have a MERCON license because none are available.
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Logistics Pro
Joined: May 2017
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From: Southern OH
That's all right, the transmission fluid doesn't care if it has a license or not.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
But you should care, because without the license how do you know what's in the transmission fluid? Did the manufacturer put Type F in the bottle and say it is for use where MERCON was specified? That's legal. Without a license the fluid can be ANYTHING, you're trusting the company that made it to do the right thing.
Maybe they do and I've just become cynical from working at some of these large corporations where the only thing that counts is making a profit.
Maybe they do and I've just become cynical from working at some of these large corporations where the only thing that counts is making a profit.
Logistics Pro
Joined: May 2017
Posts: 3,523
Likes: 483
From: Southern OH
But you should care, because without the license how do you know what's in the transmission fluid? Did the manufacturer put Type F in the bottle and say it is for use where MERCON was specified? That's legal. Without a license the fluid can be ANYTHING, you're trusting the company that made it to do the right thing.
Maybe they do and I've just become cynical from working at some of these large corporations where the only thing that counts is making a profit.
Maybe they do and I've just become cynical from working at some of these large corporations where the only thing that counts is making a profit.
https://pqia.org/automatic-transmission-fluid/
Tuned
Joined: Jul 2007
Posts: 412
Likes: 13
From: Vacaville, California
The thing is that there are no (not that I am aware of) modern transmissions requiring a Mercon V spec..... the current specs have all exceeded the previous spec. So few (very few) qualify (license) oil for an outdated spec. Recommended or as I see it "backwards compatible" is a spec that generally exceeds the spec for which it is recommended.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
There are still several MERCON V licensed fluids on the market.
Later fluids such as MERCON LV or MERCON SP or *NOT* backward compatible. They will both tear up a MERCON V transmission in short order.
Later fluids such as MERCON LV or MERCON SP or *NOT* backward compatible. They will both tear up a MERCON V transmission in short order.
Tuned
Joined: Jul 2007
Posts: 412
Likes: 13
From: Vacaville, California
Agreed, I don't think those specs claim any backwards compatibility.... and I don't think that I was suggesting that those specs were backwards compatible. IMO a backwards compatible spec meets all the minimum requirements and exceeds in the rest... LV doesnt meet the vis and I'm guessing (without looking it up) SP falls short as well.
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