What diff lube should I use? - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 02-01-2010, 07:34 PM Thread Starter
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What diff lube should I use?

Going to change my diff fluid Should I use Amsoil or Royal Purple 75w140?
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post #2 of 18 Old 02-02-2010, 05:46 AM
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I'd stick with OEM. It's full synthetic too...

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post #3 of 18 Old 02-02-2010, 06:48 AM
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I use amsoil, look at my sig
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post #4 of 18 Old 02-02-2010, 07:06 AM
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i used ams oil, i dont think it really matters as long as its at least oem.

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post #5 of 18 Old 02-02-2010, 08:23 AM
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I would use Amsoil before the RP any day.
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post #6 of 18 Old 02-02-2010, 08:30 AM
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Im using royal purple and will keep using it.

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post #7 of 18 Old 02-02-2010, 08:31 AM
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Amsoil Severe Gear is very good stuff. I used RP when I changed gears, but next fluid change will be to Amsoil.

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post #8 of 18 Old 02-02-2010, 09:15 AM
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I have seen some test results that really don't favor the RP. I put RP in my Mustang recently when I rebuilt the posi and swapped to 4.10 gears but I am going to drain it and switch it over to Amsoil.
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post #9 of 18 Old 02-02-2010, 09:30 AM
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Probably the same test I saw that showed Amsoil Severe Gear winning every test by a large margin. The test was performed by Amsoil though, so who knows. It does seem like a good product though. The RP didn't do as well because its viscosity is lower (hence their MPG claims) and it didn't protect against corrosion very well.

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post #10 of 18 Old 02-02-2010, 04:21 PM
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Another thing is that ams is cheaper than royal purple. Especially with their preferred customer program. Even with the first purchase it is still cheaper than RP
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