Hello all.
New to ATVs. I have plenty of sled experience, but this year, I thought I'd try out ATVs
I purchased 2 Kawasaki's and a Polaris
I am doing all the maintenance before summer starts (still have snow here in tahoe)
I was reading somewhere about hypoid in the rear diff.
I have 2 qts of Castrol 80w90. Is it safe to use? The Castrol website says yes, but I thought I'd ask people that may actually use the stuff.

By the way, I have a bayou 220, a Prairie 300, and an Xpedition 325.
Pictured is the product.
I tried to use the search, but nothing came up about this specific oil

Thanks all in advance