u/CommercialTheory7831

Took truck in for trans fluid/filter and diff oil change.
(Gotta go back tomorrow for front diff)

Diff oil came out gray/silver and very liquidy😅
Mechanic brought up maybe the guy who did it last could have used wrong oil?
(Niether of us would know-it’s a pre owned I got last year)

Myself and mechanic noticed no signs of failing diff while driving… no noises or clunking.
He warned me could still be bad….

Is it possible water or something else?

Basically I’m asking if I need to hit the panic button or not?