Is there a difference between greases marked NLGI#2? Found a bunch of prods at the local auto-ripoff labeled NLGI#2 - but only 1 that specifically states moly to be in it: http://www.valvoline.com/pages/products/product_detail.asp?product=68 ...Is this OK for the birfields even though it is labeled as GP? Also I assume Mobile1 gear oil is OK for the diff... is that correct? Manual calls for 90wt, Mobile1 is 75W/90. Other than that I am ready to rip!!!