Slapperbar
Retired Navy NDT Examiner
Yes there can. But should there be? HELL NO! Red shouldn't be there, unless it's Red Line Synthetic oil. The heavy shock proof is the only red oil I've used or seen for a Diff.. It's pretty thick.
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Somebody did something clever to your truck 

I don't know what means and the value, in liters... Please, help!!!
I put new photos with the truck, axles and frame, here:
