Dif fluid question.

I have a 2011 can am outlander 650 max xt. I went for a ride last weekend and today was the first time I was actually able to check the thing over and I was checking all the fluids.

I opened up the rear dif and it was good but when I opened the front dif oil started coming out (making me believe water was in there) so I’m just gunna change the front and rear dif oil just in case.

I hear people saying to use 75/90 in both front and rear and then I see 75/90 in the front and 75/140 in the rear. What should I use?