RubyRedX3

So I am doing my 150,000 mile service on my 2015 F150 XLT SC 4X4. It was my understanding the the transfer case fluid was changed from XL-12 to MERCON LV. But my owners manual shows 1.5 qts of XL-12 (Shift-on-the-fly). Has it been upgraded to MERCON LV across the whole fleet (F150 and F250 only)?

Also what part numbers do I need for the two drive belts. I am getting conflict numbers.


Thanks for any input.

20004.6

XL-12 in the shift on the fly transfer case. Mercon LV in the 2 speed torque on demand (4 auto) transfer case.

RubyRedX3

The issue I am having is Everywhere I look it comes up stating that MERCON LV replaces XL-12 in the transfer case.

Tasca page

Rock Auto page

Bubbabiker

I would stick with the thicker Dex/Mercon type fluid for this type of shift on the fly transfer case.
BTW, Valvoline has a XL-12 compatible replacement.
https://www.valvoline.com/our-produc...fer-case-fluid

BadCon

XL-12 is just Mercon transmission fluid, but Ford does not license the Mercon name anymore so its called XL-12. Mercon LV is a suitable replacement, which is why Ford swapped over. The Valvoline Full Synthetic Transmission fluid is actually thinner then Mercon LV by a hair, making it essentially identical. I'm currently using the Valvoline stuff, and numerous 600whp 4x4 launches later and it is still going strong lol.