Twelve quarts of Ford-spec Mercon LV ATF for 6R80, 6R140, 6F35 and 6F50 transmissions - enough fluid for a full cooler-line exchange.
If you are servicing a 6R80 in a 2009-2017 F-150, an Expedition, a Navigator or a Mustang, one bottle of fluid is never enough. This is a full case of Motorcraft MERCON LV, Ford part number XT-10-QLVC: twelve one-quart bottles, 11.4 liters in all, made to Ford's WSS-M2C938-A specification. It is the quantity that actually matches the jobs people do on these transmissions: a pan and filter service with fluid left over for the follow-up drain, a cooler-line exchange, or the first fill after an overhaul.
The 6R80 is a six-speed rear-drive unit run almost entirely by solenoids. The fluid is the hydraulic oil those solenoids meter to apply each clutch, the lubricant for the planetary sets, and the friction medium for the torque converter clutch. Ford calibrated the shift and converter-apply tables around a low-viscosity oil; Motorcraft's data sheet lists it at 6.0 cSt at 100 C with a viscosity index of 155 and a pour point below -48 C. Put a thicker fluid in and the circuits fill and exhaust at a different rate than the computer expects, which shows up as harsh shifts and converter shudder. ATRA's GEARS Magazine documented a 6R80 converter chatter case that was cured simply by refilling with the correct MERCON LV.
A fluid change will not fix a failed lead frame or worn valve body bores, so scan for codes before you buy. Our 6R80 common problems guide separates fluid-related complaints from the electrical and hydraulic failures this unit is known for. Then read the 6R80 fluid type and capacity guide for Ford's published fill numbers, so you know how much you need before the truck is on the lift.
Ford lists the 2015 F-150 6R80 at about 13.1 quarts dry fill, but a pan drop only gives up roughly five to six quarts because the converter and cooler stay full. That means one service replaces well under half the old oil. Our 6R80 F-150 fluid change walkthrough shows the dilution math: two back-to-back drain and fills get you to roughly two-thirds new fluid, and a case covers both. For reference on bigger jobs, Ford's Customer Satisfaction Program 16N02 for the molded lead frame allotted nine quarts of XT-10-QLVC per repair, and Ford's overhaul procedure calls for eight quarts on the initial fill before topping off to level.
MERCON LV is the specified fluid for the Ford 6R60, 6R75 and 6R80 rear-drive six-speeds, the 6R140 TorqShift behind the 6.7L Power Stroke, and the 6F35, 6F50 and 6F55 front-drive six-speeds. Ford also uses it in place of the discontinued MERCON SP for the 5R110W. It is not backward compatible with MERCON V (4R70W, 5R55, 4R100) and it is not MERCON ULV, which the 10R80 in most 2017-and-later F-150s requires. Some 2017-2020 trucks can have either transmission depending on engine, so check the door jamb transmission code or send us your year and VIN if you are unsure. Everything else for this unit is in our 6R80 parts collection.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
For a pan and filter service, yes, with fluid to spare. A pan drop typically takes five to six quarts, so a case covers two back-to-back drain and fills. A full cooler-line exchange can use most or all of the case, and a dry unit after overhaul takes about 13 quarts total, so a rebuild may need an extra quart or two.
No. The 10-speed 10R80 takes MERCON ULV, and older units such as the 4R70W, 5R55 and 4R100 take MERCON V. MERCON LV is only correct where the owner manual or transmission tag calls for it, such as the 6R60, 6R75, 6R80, 6R140, 6F35 and 6F50/6F55.
Ford specifies MERCON LV as the replacement for the discontinued MERCON SP in 5R110W TorqShift transmissions, so this case is the current fluid for that service.
Sometimes. Worn or wrong fluid is a known cause of converter shudder, and a correct MERCON LV refill has cured it in documented cases. If the shudder continues after two services, look at the torque converter clutch solenoid, the valve body and the lead frame.
With the engine running, cycle through the gears and let the fluid reach operating temperature (Ford's window is about 206-215 F). Read the level at the check plug and let any excess drain until it drips. Do not judge the level cold.
