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Ford 6R80E fluid for previous overheating issues - Mercon LV vs. XL12 (did Ford change the fluid since 2013?) or better fluid recommendation

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Duane Black

Curbs go brrrppp
581
415
Exp. Type
Time Attack
Exp. Level
5-10 Years
Durham, NC
So I had 20 quarts of fluid run through my car at Ford Quicklane as part of my seasonal maintenance.

According to Quicklane, the part number was XT-10QLVC for the swap, and it's Mercon LV.

I looked it up, and it apparently replaced some XT-12 fluid for all Ford transfer cases.

The car never had a hot transmission with the old fluid, and it's now getting hot and throwing me out of Sportshift mode after ~15ish minutes and I believe this fluid may be a culprit.

Does anyone have any idea what the viscosity would be and/or recommend a replacement fluid to circumvent this issue? Thanks!
 

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