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Discussion Starter #1
Hello I was wondering if anybody else came across this problem. I have a 2015 Transit 350 with the 3.7l. everywhere I look there is no info for the rear differential oil type. Can someone help me find what weight oil in should replace it with? 80/90, 75/140, 85/140? Thank you
 

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from the 2015 owners manual page 440: http://www.fordservicecontent.com/Ford_Content/Catalog/owner_information/2015-Transit-Owners-Manual-version-2_om_EN-US_05_2014.pdf

Exceptions
There are several exceptions to the Normal
Schedule:
Normal vehicle axle maintenance: Rear
axles and power take-off units with
synthetic fluid and light-duty trucks
equipped with Ford-design axles are
lubricated for life; do not check or change
fluid unless a leak is suspected, service is
required or the assembly has been
submerged in water. During long periods
of trailer towing with outside temperatures
above 70°F (21°C) and at wide-open
throttle for long periods above 45 mph
(72 km/h), change non-synthetic rear axle
fluid every 3000 mi (4,800 km) or three
months, whichever comes first. This
interval can be waived if the axle is filled
with 75W140 synthetic gear fluid meeting
Ford specification WSL-M2C192-A; GL-5
or equivalent. Add friction modifier XL-3
EST-M2C118-A or equivalent for complete
refill of Traction-Lok rear axles. See
Capacities and Specifications (page
265).
Police, Taxi and Livery vehicle axle
maintenance: Change rear axle fluid every
100000 mi (160,000 km). Rear axle fluid
change may be waived if the axle was filled
with 75W140 synthetic gear fluid meeting
Ford specification WSL-M2C192-A; GL-5
or equivalent. Add four ounces (118
milliliters) of additive friction modifier XL-3
EST-M2C118-A, or equivalent, for complete
refill of Traction-Lok rear axles. Change
the axle fluid anytime the axle submerges
in water.

from the 2016 owners manual:
Rear axle fluid (limited slip): WSS-M2C942-A
Motorcraft SAE 75W-85 Premium Synthetic Hypoid
Gear Lubricant
XY-75W85-QL

Rear axle fluid (conventional): WSS-M2C942-A
Motorcraft SAE 75W-85 Premium Synthetic Hypoid
Gear Lubricant
XY-75W85-QL

Rear axle friction modifier (U.S. and Mexico): EST-M2C118-A
Motorcraft Additive Friction Modifier
XL-3
Rear axle friction modifier (Canada): EST-M2C118-A
Motorcraft Additive Friction Modifier
CXL-3

Rear axle fluid (limited slip) 2.9 qt (2.72 L)
Rear axle fluid (conventional) 3.0 qt (2.84 L)
Rear axle friction modifier 4.0 fl oz (118 ml)

My opinion:
change your axle fluid (differential oil) every 50,000 miles with a good synthetic oil (If you want it to outlast your vehicle). Ford and all other OEM's say "lifetime fluid" but that is only to decrease the maintenance influence on Total Cost of Ownership (TCO) that fleet managers are worried about. Change it immediately if you have driven through high water (flooded streets) or backed a boat into water and have reason to believe water went over the rear axle. The Ford synthetic mentioned is good oil. Its also hard to beat Mobil 1 synthetic. They also specify two weights of oil, in 2015 - 75W140 and in 2016 75w85. Its really not going to make much of a difference, but many think that 75W140 will provide better gear protection at the cost of a very very small bit of MPG compared to 75W85 or 75W90.
 

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Discussion Starter #4
Hello
Thanks for the responses. It is not the limited slip. I'm going to use a synthetic 75W 140. As my van has 246K and probably has never been changed.
 
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