Differential oil
Thread Starter
|
Freshman User
Joined: Aug 2003
Posts: 30
Likes: 0
Differential oil
Hi to All,
I want to replace the differential oil in my 2003 F 150.
My question is: will Mobil 1 75w-140 meet Ford Specs? (WSL-M2C192-A)
Also can I use Ford's friction modifier (EST M2C118-A)with the Mobil 1 75w140 as it is a limited slip differential.
Thanks,
Ned
I want to replace the differential oil in my 2003 F 150.
My question is: will Mobil 1 75w-140 meet Ford Specs? (WSL-M2C192-A)
Also can I use Ford's friction modifier (EST M2C118-A)with the Mobil 1 75w140 as it is a limited slip differential.
Thanks,
Ned
Senior User
Joined: Jan 2006
Posts: 289
Likes: 0
From: North Texas
Originally Posted by pilot737
I changed my read dif on my 01 screw, and found the OEM fluid was very clear and clean at 60k miles. As it was draining, I was wishing I had never drained it!
Also the Motorcraft OEM fluid is a synthetic
Also the Motorcraft OEM fluid is a synthetic
The Royal Purple that I replace it with was, well, purple. So it will be more difficult to tell the condition of the oil when I drain that out, but who knows how long it will be before that happens.
New User
Joined: Sep 2006
Posts: 2
Likes: 0
Good choice in using Motorcraft fluids. I was shocked when I learned the gear oil was synthetic. I use all motorcraft fluids and filters. The trany oil in my 2001 Screw is synthetic too. Ford does not have its head in the sand where fluids and filters are concerned. I have been using the Motorcraft 5-20 oil since new and now have 85k on my truck. The other day I climbed up on the bumper to shine a flashlight down the oil fill tube. I could see the top of the camshaft and a few other engine parts. All were shinny like stainless steel, and I knew the insides of my engine were nice and clean.
2001 F-150 Screw 4.6L
2001 F-150 Screw 4.6L
Posting Guru
Joined: Jul 2005
Posts: 1,940
Likes: 0
Originally Posted by Ned Nimrod
Thanks, I am going with the Motorcraft.
Ned
Ned
Trending Topics
Senior User
Joined: Jan 2006
Posts: 289
Likes: 0
From: North Texas
The Royal Purple was actually cheaper than other synthetics at the parts store. That and the fact that it already had the limited slip additive made my mind up for me.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
New User
Joined: Jan 2005
Posts: 15
Likes: 0
Im getting ready to change the gear oil in my rear differential and I was looking in to Mobil 1 75W140, my question is this....it claims to have the LS additive in it already....does anyone have experience in using Mobil 1 in their rear? I have a feeling if I put it in there Im going to end up needing to add the LS additive.
Posting Guru
Joined: Dec 2001
Posts: 2,017
Likes: 2
From: Southeast FLA
I made that mistake - I thought that, on a 4x4, I would have had a LS rear end for sure (I got this used truck in a round-about way, so I didn't have the chance to check for it when I bought it).
Anyway, at, oh, about 88,000 miles my rear differential fluid was DIRTY. I'm talking black, on its way to being grey.
Like I've stated before, the truck was used as an F-250 for its first life, clutch being changed at 50k miles, but I really wasn't happy. When I got in there I did my best to use a magnet to clean up particles, and to wash away debris with new fluid. Still, as of 105k miles with that new fluid, the magnet on the filler-plug was full of debris again. The fluid, however, looked better this time.
Now the front differential's fluid looked brand new, so I didn't change it.
The tranny fluid, however, looked worse than the rear diff's fluid... ouch.
I used Mobil 1, and am happy with it.
Anyway, at, oh, about 88,000 miles my rear differential fluid was DIRTY. I'm talking black, on its way to being grey.
Like I've stated before, the truck was used as an F-250 for its first life, clutch being changed at 50k miles, but I really wasn't happy. When I got in there I did my best to use a magnet to clean up particles, and to wash away debris with new fluid. Still, as of 105k miles with that new fluid, the magnet on the filler-plug was full of debris again. The fluid, however, looked better this time.
Now the front differential's fluid looked brand new, so I didn't change it.
The tranny fluid, however, looked worse than the rear diff's fluid... ouch.
I used Mobil 1, and am happy with it.
Posting Guru
Joined: Jul 2005
Posts: 1,940
Likes: 0
Originally Posted by STLBluesRams34
Im getting ready to change the gear oil in my rear differential and I was looking in to Mobil 1 75W140, my question is this....it claims to have the LS additive in it already....does anyone have experience in using Mobil 1 in their rear? I have a feeling if I put it in there Im going to end up needing to add the LS additive.
