sticky or runny

I was going to drop the EP in the transfer box this weekend provided it doesn't p*ss down again and while I was visiting the factors I noticed there is a synthetic multigrunge EP70w95 and not stunningly expensive ( very nice man ) but I was thinking surely a good idea in the box but if its a lower viscosity at low temperatures it has to be sod all use in the swivels - image forming in mind of two pools of oil on the floor inside the front wheel or am I being overly critical ? I have enough EP floating about to do the TB or possibly the diffs but maybe I should just stick with another gallon of EP90 and do the lot? Derek