Diferential Oil for Lehman

Hey everyone, Just need some feedback on a possible issue. Without realizing, thought I purchased 75-90 gear oil, but ended up getting 80 - 140. Did not realize what I had done until the 2nd pump into the diff. Going to top of with the 75-90. Can this cause problems.

I am experiencing a differential leak, which I am thinking is the pinion seal. The leak is more nuisance, because I just continue to add some occasionally.

Thanks for any guidance

Dan

Have no knowledge if you're OK or not:confused:
I'd dump it and put the right weight in, if it were mineThumbUp

Would not have hurt it either way ......