so I bought the hoss last week and bought the traxxas 4s esc put it into the hoss ran it a few times destroyed the rear differentials need to find out what differential fluid would be best for me I was told the 500k weight but trying to figure this out so I can go run it

Upgrading to a 4S ESC in your Traxxas Hoss definitely demands stronger diff support. 500k weight fluid is a solid choice, balancing power and stability. If you’re pushing the limits, consider 1M weight for even better control. Regular maintenance will keep your diffs in top shape with your new setup!