Redline differential oil?

[Condor1970]

I have a quick question. As I go on Redlines website, and ask for fluids for 2018 Mustang GT 5.0L with LSD, it gives me 75w85 GL-5 diff oil as their recommendation. Yet, when I go on various websites, like Lethal Performance and others, they readily list Redlines 75w90 GL-5 as what they sell for the Mustang LSD's.

I just did the rear diff on my GT, and filled it with 75w-90 GL-5. Is there any possible issue with doing this?

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[EFI]

Is there any possible issue with doing this?

No you'll be fine as long as you got the correct one for your application (in terms of needing or not the friction modifier).