Can you mix differential fluid brands?

Joined
Apr 3, 2021
Messages
22
I put Mobil 1 75w90 in my F150s front diff when I last changed it and went to vacuum it to replace it with amsoil 75w90 but my cheap hand pump just wasn’t cutting it so I bailed halfway through and added a quart of amsoil to bring it back to the correct level. Is there any harm done with combining different brand diff fluids like that?
 
Joined
Aug 11, 2016
Messages
645
Location
new jersey
i did, it was only a couple ounces so i could get the diff. level up, it was 3 qts REDLINE and .20 oz. SUPERTECH
 
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