Need some help... 1993 Mazda B2600 Pickup
 

I need to know what type of wheel bearing grease I should use for the rear wheel bearing on my 1993 Mazda B2600 Pickup Truck? I have called Mazda and my local mechanic and neither one really knew what i was talking about. Mazda told me 80W90 but that is too thick. Any thoughts or suggestions would greatly be appreciated. Thanks in advance!!