Amsoil rear end oil

[Canadian Crimson]

A quick question regarding Amsoil. I ordered it via their website and got what they recommended. I noticed looking at their product they recommend the same oil whether its an open diff or limited slip, and says no additives required. Do you still need the "friction modifier" that Ford recommends?

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[NightmareMoon]

Specifics... what weight oil did you get?

 

[Canadian Crimson]

Specifics... what weight oil did you get?

75W85 same as which is what it calls for

 

[NightmareMoon]

75W85 same as which is what it calls for

Amsoil Severe Gear does say it already includes the friction modifiers....

 

[Canadian Crimson]

Amsoil Severe Gear does say it already includes the friction modifiers....

Yup, I realize that, which was why I asked. They list the same product for open or limited slip.

 

[Xzavior1818]

Hmm wonder if I should do mine. I'm at 31k miles 2019 gt

 

[Canadian Crimson]

Hmm wonder if I should do mine. I'm at 31k miles 2019 gt

Mine has less than 20k miles on it but it is 7 years old. I have only had the car for three summers , but going to do the transmission, and rear ends this year.

 

[Emilbadal]

I wouldn't recommend adding friction modifier to an oil that already says it has the friction modifier. I'm running the Amsoil without added FM. Before I did have extra friction modifier in the previous fill, and the differential would play stupid if a wheel was in the air(like pulling into a driveway that would cause one of the rear wheels to lift) and it would slip until I revved the engine high enough to get it to engage which was pretty sketchy. But now it acts pretty normal and engages when it's needed quickly.

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