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Old 01-09-2022, 07:15 PM   #1
CHS
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Brand: Thor Motor Coach
Model: 2019 Chateau 28Z
State: Tennessee
Posts: 487
THOR #22388
E450 Rear Diff Fluid

Reference a 2018 Ford E450.
Wanting to change my Differential fluid in a few weeks. Manual states
SAE 80-90 but watching a YouTube video and they stated that Ford now recommends 75-140.
So why does it NOT state this in my manual. From what I read, this is been for a while now.
What are you all using? I see Amsoil has the 75-140 synthetic oil at a good price.

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2019 Thor Chateau 28Z 2018 E-450 Chassis W/ V10
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Old 01-11-2022, 12:57 AM   #2
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Brand: Thor Motor Coach
Model: Four Winds
State: California
Posts: 406
THOR #24260
Fomoco updated there oil. There oil IS $$$$$
Youtube it
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Old 01-11-2022, 01:53 AM   #3
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Brand: Thor Motor Coach
Model: 2019 Chateau 28Z
State: Tennessee
Posts: 487
THOR #22388
I ended up buying Amsoil 75-90 severe gear oil. Actually cheaper than motorcraft.
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Old 01-11-2022, 01:58 AM   #4
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Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 6,876
THOR #13932
Do it outside.
Few things smell as bad and stay in your sinuses longer.
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Old 01-12-2022, 11:41 AM   #5
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Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 1,158
THOR #9178
Great advice by DF

I always used synthetic in my F350, F550 pickups ever since it was available

They all had the heat exchanger plates and if you don't have then you have some extremely hot temperatures when getting down the road on a hot day
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